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Giải thích chi tiết Cambridge IELTS 14 Reading Test 4

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Để giúp các bạn thí sinh có thể cải thiện khả năng Reading trong IELTS một cách nhanh nhất thì IELTS JENNY nghĩ rằng giải thích chi tiết các đáp án của các bài Test trong Cambridge IELTS là một trong những phương pháp hiệu quả. Dưới đây là Giải thích chi tiết Cambridge IELTS 14 Reading Test 4

1. four / 4

Question: Focused on a total of 1…………. different age groups of ants,


– Focused on

– different age groups = age ranges

– of ants = on ants

Explain: In paragraph 3, it is stated that “Giraldo focused on ants at four age ranges”, so the answer must be “four/4”.

2. young

Question: how well ants looked after their 2…………..


– how well ants = how well the ants

– looked after = took care of

Explain: The first sentence of paragraph 4 states that “Giraldo watched how well the ants took care of the young of the colony”

3. food

Question: their ability to locate 3…………… using a scent trail


– Locate = mark a trail to

– using a scent trail = followed the telltale scent

Explain: In the second sentence of paragraph 4, the author mentions how ants “followed the telltale scent that the insects usually leave to mark a trail to food”. This means that she studied ants‟ ability to locate food using a scent trail.

4. light

Question: the effect that 4……………. had on them

Keywords: The effect = responded to

Explain: In the same paragraph, we are told that “she tested how ants responded to light”, meaning that she tested the effect of “light” on ants

5. aggressively

Question: how 5…………….. they attacked prey

Keywords: Attacked, prey = the poor fruit fly

Explain: Still in paragraph 4, Giraldo compared the way old and young ants attacked their prey and found that the old ones attacked “just as aggressively” as the young ones did. In other words, she studied how aggressively they attacked the prey.

6. location

Question: comparison between age and the 6……………… of dying cells in the brains of ants

Keywords: comparison between = no major difference age of dying cells

Explain: In paragraph 5, we know that Giraldo didn’t find any major difference in age and the location of dying brain cells between 20-day-old and 95-day-old ants. This suggests that she compared between the age and location of dying cells.

7. neurons

Question: condition of synaptic complexes (areas in which 7…………… meet) in the brain’s ‘mushroom bodies’


– in the brain’s ‘mushroom bodies’ = in their brains called mushroom bodies,

– areas in which = where

– Meet = come together.

– synaptic complexes

Explain: In paragraph 5, it is stated that synaptic complexes are “regions where neurons come together”

8. chemicals

Question: level of two 8………….. in the brain associated with ageing


– Level of two = levels of either serotonin or dopamine-brain

– associated with ageing = coincides with aging

Explain: Still in paragraph 5, we are told that Giraldo studied the level of serotonin and dopamine, which are two “brain chemicals whose decline often coincides with aging”. This implies that they are associated with aging. Thus, the answer is “chemicals”.


Question: Pheidole dentata ants are the only known animals which remain active for almost their whole lives.


– Remain active = doesn’t seem to show any signs of aging = stay fit

– or almost their whole lives = for nearly their entire lives.

Explain: In paragraph 2, the author mentions naked mole rats as an age-defying animal: they stay fit for nearly their entire lives and they can reproduce even when old. It can be said that they remain active for almost their whole life. Thus, Pheidole dentata ants are not the only animal with this feature.

10. TRUE

Question: Ysabel Giraldo was the first person to study Pheidole dentata ants using precise data about the insects’ ages.

Keywords: precise data about the insects’ ages = their exact ages.

Explain: It is stated in paragraph 3: “Unlike all previous studies, which only estimated how old the ants were…she knew their exact ages”. This means that she was the first person to use the ants’ exact ages in her studies.


Question: The ants in Giraldo’s experiments behaved as she had predicted that they would.


Behaved = perform

Predicted = expected

Explain:  It is stated in paragraph 4 that “Giraldo expected the older ants to perform poorly…but the elderly ants were all good caretakers and trail-followers”. This implies that the elderly ants behaved differently from what she expected (predicted). She thought that they would perform badly, but they performed well.


Question: The recent studies of bees used different methods of measuring age-related decline.


– age-related decline.

– The recent studies of bees = the results of recent bee studies

Explain: With regard to recent studies of bees, the author only mentions in paragraph 6 that the results about age-related decline were mixed: some showed it while some didn’t. However, there is nothing said about the methods used, so this statement is NOT GIVEN.

13. TRUE

Question: Pheidole dentata ants kept in laboratory conditions tend to live longer lives.

Keywords: Pheidole dentata laboratory, live, longer

Explain: The first sentence of paragraph 3 reveals that in the lab, Pheidole dentata ants typically live for around 140 days. Later, in paragraph 7, it is said that “out in the wild, the ants probably don’t live for a full 140 days”. This clearly means that the ants tend to live longer in laboratory conditions. The statement is therefore TRUE.

14. B

Question: a reference to how quickly animal species can die out


– die out = are becoming extinct

– how quickly = Colossal numbers of species + are increasingly threatened

Explain: It is mentioned in paragraph B that “some of these collapses have been sudden, dramatic and unexpected”, with “these collapses” referring to the extinction of animals. The word “sudden” is a synonym for quickly, so the sentence suggests that some animals may become extinct, or die out, quickly.

15. E

Question: reasons why it is preferable to study animals in captivity rather than in the wild


– Reasons: less risk + fewer variables

– study animals in captivity =undertake research on animals in zoos

Explain: The term “animals in captivity” is another way of saying “animals in zoos”. The role of zoos in animal research is mentioned in paragraph E: “Being able to undertake research on animals in zoos where there is less risk and fewer variables means real changes can be effected on wild populations”. So, zoos have many advantages for studying how animals live, act and react. Thus, – The answer is paragraph E.

16. C

Question: mention of two ways of learning about animals other than visiting them in zoos


– two ways of learning about animals: television documentaries + natural history specimens

– visiting them in zoos = seeing a living creature

– in the flesh, hearing it, smelling it, watching what it does

Explain: Several ways of learning about animals are mentioned in paragraph C: zoos, television documentaries, and museums. Thus, this paragraph shows two ways of learning about animals other than visiting them in zoos.

17. A

Question: reasons why animals in zoos may be healthier than those in the wild

Keywords: Reasons: get a varied and high-quality diet with all the supplements required + any illnesses they might have will be treated

Explain: The first sentence of the passage is: “it is perfectly possible for many species of animals living in zoos or wildlife parks to have a quality of life as high as, or higher than, in the wild”. Higher quality of life implies that zoo animals may be healthier than those in the wild. The author then goes on to discuss various reasons why zoos are healthy places for animals, including a good diet, treatment of illnesses and a safe environment from predators.

18. TRUE

Question: An animal is likely to live longer in a zoo than in the wild.

Keywords: live longer = have a greater life expectancy

Explain: As we know from question 17, the comparison between animals living in zoos and in the wild is in paragraph A. “The average captive animal will have a greater life expectancy compared with its wild counterpart”. The captive animal refers to animals in zoos. Its wild counterpart refers to animals of the same species in the wild.

19. TRUE

Question: There are some species in zoos which can no longer be found in the wild.


– can no longer be found in the wild = only exist in captivity

– some species in zoos = many of these living in zoos

Explain: It is stated in paragraph B that “A good number of species only exist in captivity”, implying that these species cannot be found in the wild. The statement is TRUE.


Question: Improvements in the quality of TV wildlife documentaries have resulted in increased numbers of zoo visitors.

Keywords: improvements, TV, wildlife, documentaries, increased, numbers, zoo visitors

Explain: With regard to TV documentaries, the author only mentions (in paragraph C) that “television documentaries are becoming ever more detailed and impressive” but there is no relation between this and zoo visitor numbers. This information is NOT GIVEN.


Question: Zoos have always excelled at transmitting information about animals to the public.

Keywords: transmitting information about animals to the public = communication and outreach work

Explain: Paragraph D states that zoos can “communicate information to visitors about the animals they are seeing and their place in the world”. In other words, zoos can transmit information about animals to the public. It is mentioned, however, that “this was an area where zoos used to be lacking”, implying that zoos were not good at this in the past. The statement is therefore FALSE.


Question: Studying animals in zoos is less stressful for the animals than studying them in the wild.

Keywords: Studying animals in zoos = undertake research on animals in zoos

Explain: In comparison with studying animals in the wild, studying them in zoos is less risky and involves fewer variables. We only know that there is less risk for both the animals and the scientists themselves, but we do not know if studying animals in zoos is less stressful. There is no information regarding this.

23-24. B, D

Question: Which TWO of the following are stated about zoo staff in the text?

B   Some travel to overseas locations to join teams in zoos.

D   Some teach people who are involved with conservation projects


– travel to overseas locations = send their animal keepers abroad

– join teams in zoos = contribute their knowledge and skills to those working in zoos and reserves…

– Teach = educate

– people who are involved with conservation projects = conservation workers


– It is stated in paragraph D that: “Many zoos also work directly to educate conservation workers in other countries” -> zoo staff can teach conservation workers, or people involved with conservation projects. So D is correct.

– “…or send their animal keepers abroad to contribute their knowledge and skills to those working in zoos and reserves”. This means that some animal keepers (a type of zoo staff) travel to overseas to help other zoo staff. So B is correct

25-26. B, E

Question: Which TWO of these beliefs about zoos does the winter mention in the text?

B   They can increase public awareness of environmental issues.

E   They can raise animals which can later be released into the wild.


– Raise public awareness of environmental issues = he need to be more environmentally conscious

– Increase = more

– public awareness of environmental issues.

– raise animals = can be bred up to


– In paragraph B, it is stated that some animals have been reintroduced into the wild from zoos, or that wild populations have been increased by the introduction of captive bred animals. The term “reintroduce” means that animals will be raised in zoos before being released into the wild. So E is correct.

– Thus, the sentence can be paraphrased into: zoos can increase public awareness of environmental issues. B is correct.


Question: Rochman and her colleagues were the first people to research the problem of marine debris.


– Rochman and her colleagues

– the problem of marine debris = the state of marine debris

Explain: Paragraph 2 mentions that “plenty of studies have sounded alarm bells about the state of marine debris” and that “Rochman and her colleagues set out to determine how many of those perceived risks are real”. This implies that there has been other research on marine debris before Rochman and her colleagues, and they want to examine these previous studies. Thus, the statement is FALSE.


Question: The creatures most in danger from ocean trash are certain seabirds.

Keywords: certain seabirds

Explain: Paragraph 3 only mentions that “certain seabirds eat plastic bags” but we do not find any information about them being the most in danger. Scientists have only “speculated” about wider effects: “There wasn’t a lot of information”. Thus it is NOT GIVEN.


Question: Combining work with play may be the best way for children to learn.


– Combining work with play = this mid-point between play and work

– be the best way for children to learn = create robust opportunities for playful learning.

Explain: Joan Goodman (paragraph 7) suggested that “hybrid forms of work and play can provide optimal contexts for learning”. This means that such hybrid, or combination, could be the best way for children to learn.

30. TRUE

Question: Rochman analysed papers on the different kinds of danger caused by ocean trash.


– different kinds of danger = 366 perceived threats

– analysed = examined

– ocean trash = marine debris

Explain: Paragraph 4 states that “Rochman and her colleagues examined more than a hundred papers on the impacts of marine debris” and found 366 perceived threats. It can be understood that these papers focused on various kinds of danger (threat) caused by ocean trash (marine debris).


Question: Most of the research analysed by Rochman and her colleagues was badly designed.


– was badly designed = weaknesses in design

– research = studies

Explain: In paragraph 5, the author states that “In 83 percent of cases, the perceived dangers of ocean trash were proven true”. So, there is obviously no reason to think that this research was badly designed if the findings were proven true, “In the remaining cases, the working group found the studies had weaknesses in design”. Therefore, only 17 percent of the cases analysed were badly designed. So, most of the cases were well designed. The statement is FALSE.

32. TRUE

Question: One study examined by Rochman was expecting to find that mussels were harmed by eating plastic.


– One study = only one well-designed study

– was expecting to find = failed to find

Explain: The information about mussels (a type of shellfish) can be found in paragraph 6 The study examined mussels that eat plastic, “but it didn’t seem to stress out the shellfish”. This means that the plastic didn’t seem to have any harmful effect on the mussels. Rochman said this study “failed to find the effect it was looking for”, so clearly it was looking for some effect of the plastic on the mussels.


Question: Some mussels choose to eat plastic in preference to their natural diet.

Keywords: some, mussels, choose, eat, plastic, preference, natural, diet

Explain: Paragraph 7 only states that the “mussels may be fine eating trash”. It does not mean they prefer trash to their natural diet. The statement is NOT GIVEN.

34. large

Question: bits of debris that were 34…………… (harmful to animals)


– bits of debris = pieces of debris

– harmful to animals = injuring themselves.

Explain: Rochman found (paragraph 8) that “most of the dangers also involved large pieces of debris” that can cause severe injuries to animals. So the answer is “large”.

35. microplastic

Question: There was little research into 35…………… e.g. from synthetic fibres


– There was little research into = found little research on

– From synthetic fibres = fibers shed by synthetic clothing

Explain: Paragraph 9 mentions that “Rochman’s group found little research on the effects of these tiny bits”, with “tiny bits” referring to microplastic. So the answer is “microplastic”.

36. populations

Question: most of them focused on individual animals, not entire 36…………….


– focused on = have looked at

– individual animals = individual animal

– entire = whole

– Not = rather than

Explain: The remaining questions refer to the drawbacks of the studies. According to paragraph 10: “Many studies have looked at how plastic affects an individual animal… rather than the whole populations”.

37. concentrations

Question: the 37……………. of plastic used in the lab did not always reflect those in the ocean

Keywords: in the lab, plastic, those in the ocean = what’s really in the ocean.

Explain: It is mentioned in paragraph 10 that “in the lab, scientists often use higher concentrations of plastic than what’s really in the ocean”. This means that the concentrations of plastic used in the lab was different from, and thus did not always correctly reflect, those in the ocean.

38. predators

Question: there was insufficient information on numbers of animals which could be affected the impact of a reduction in numbers on the 38…………… of that species The impact on the ecosystem


– there was insufficient information = None of that tells us

– numbers of animals which could be affected = how many birds or fish or sea turtles could die from plastic pollution

– the impact … on the = affects

– reduction in numbers = deaths in one species

– Of that species = that animal’s

Explain: Rochman said in paragraph 10 that no one can tell us “how deaths in one species could affect that animal’s predators”. Deaths in one species can be understood as a reduction in numbers of that species. Thus, there is insufficient information on how a reduction in numbers of a species can impact on their predators. The blank should be filled with “predators”.

39. disasters

Question: Rochman says more information is needed on the possible impact of future 39…………… (e.g. involving oil).


– more information is needed = need to be asking more ecologically relevant questions/ scientists don’t know exactly

– (e.g. involving oil) = such as a tanker accidentally spilling its whole cargo of oil

Explain: According to Rochman in paragraph11, we need to ask more “ecologically relevant questions”, such as how disasters will affect the environment before they actually happen. This means that more information related to disasters is needed. She also mentioned an oil spill as an example of the impact of future disasters which we need to know more about, by asking the right questions earlier. Hence, the answer is “disasters”.

40. A

Question: What would be the best title for this passage?

A   Assessing the threat of marine debris


– The passage does not focus on who is to blame for marine debris, nor does it focus on any new solutions or international action, which are only briefly referred to in paragraph 12. In the final paragraph, Rochman refers to the importance of “clearing up…misconceptions” in order to know how serious the threat of marine debris really is. Therefore, it is important to interrogate “the existing scientific literature” to help ecologists to figure out “which problems really need addressing”.

– The entire passage concerns Rochman and her study on other prior research on marine debris. She assessed these studies to answer the question of whether the situation is as bad as they suggested. In other words, Rochman assessed the threat of marine debris mentioned by other researchers. A is the correct answer.

Nếu bạn muốn xem phần giải thích chi tiết của các bài Cambridge IELTS Reading Test thì đăng ký tại đây: Cambridge Practice Tests for IELTS Reading with Answers

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