Storing food is common in members of the crow family. A new study tested the

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Storing food is common in members of the crow family. A new study tested the birds outside for this naturally occurring behavior, which may have evolved（进化）specifically because it gives crows a survival advantage. Some crow species are known to naturally use tools to recover food. So the researchers tested whether the birds could store and recover a tool so they could use it to find their food after a gap of 17 hours — something we wouldn’t expect them to do naturally. But they were able to instantly select the tool out of a number of unnecessary items.

In another experiment, the researchers taught crows to select a token（礼品券）from a number of items so that they could then exchange it for food. Again, the birds then showed that they could plan for the future using this new behaviour. This is different from all of the previous studies in future planning, which have focused on naturally occurring behaviour. For example, we know that chimpanzees select, transport and save appropriate tools for future needs.

These studies have shown that animals can plan for the future — but they leave an important question open for debate. Are animals only able to plan to use abilities that have evolved to give them a specific advantage, or can they flexibly and intelligently apply planning behaviour across various actions? Most critics would say the former, as the animals were tested in naturally occurring behaviour.

But the new research provides the first evidence that animal species can plan for the future using behaviour that doesn’t typically occur in nature. This supports the view that at least some recognitive（认知的）abilities in animals don’t evolve just in response to specific problems. Instead, it suggests that animals can apply these behaviour flexibly across problems in a similar way to humans. We need to study how flexible behaviour evolved. Then we might be able to see how crows’ ability to plan for the future fits in with their broader cognitive powers.

【小题1】What’s the new finding about some crows according to Paragraph 1?

A．They can store food.	B．They can use tools to recover food.
C．They can store and recover tools.	D．They can select and store food.

【小题2】What are crows trained by researchers to do when given a token?

A．Reject it casually.	B．Exchange it for food.
C．Save it as their food.	D．Build a nest with it.

【小题3】What can we infer about the studies that animals can plan for the future?

A．They are debatable.	B．They are disappointing.
C．They are logical.	D．They are convincing.

【小题4】What can be learned about flexible behaviour in animals?

A．It develops only with age.	B．It is unclear how it evolved.
C．No animals but crows benefit from it.	D．It helps plan for the future.

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同类题2

Across Britain, burnt toast will be served to mothers in bed this morning as older sons and daughters rush to deliver their supermarket bunches of flowers. But, according to a new study, we should be placing a higher value on motherhood all year.
Mothers have long known that their home workload was just as heavy as paid work. Now, the new study has shown that if they were paid for their parental labours, they would earn as much as $ 172,000 a year.
The study looked at the range of jobs mothers do, as well as the hours they are working, to determine the figure. This would make their yearly income $ 30,000 more than the Prime Minister earns.
By analysing the numbers, it found the average mother works 119 hours a week, 40 of which would usually be paid at a standard rate and 79 hours as overtime. After questioning 1,000 mothers with children under 18, it found that, on most days, mums started their routine work at 7am and finished at around 11pm.
To calculate just how much mothers would earn from that labour, it suggested some of the roles that mums could take on, including housekeeper, part-time lawyer, personal trainer and entertainer. Being a part-time lawyer, at £ 48.98 an hour, would prove to be the most profitable of the “mum jobs”, with psychologist (心理学家) a close second.
It also asked mothers about the challenges they face, with 80 percent making emotional demand as the hardest thing about motherhood.
Over a third of .mums felt they needed more training and around half said they missed going out with friends.
The study shows mothers matter all year long and not just on Mother’s Day. The emotional, physical and mental energy mothers devote to their, children can be never-ending, but children are also sources of great joy and happiness. Investing (投入) in time for parenting and raising relationships is money well spent.
【小题1】How much would a mother earn a year if working as the Prime Minister?

A．£ 30,000.	B．£ 142,000.
C．£ 172,000.	D．£ 202,000.

【小题2】The biggest challenge for most mothers is from .

A．emotional demand	B．low pay for work
C．heavy workload	D．lack of training

【小题3】What is stressed in the last paragraph?

A．Mothers’ importance shows in family all year long.

B．The sacrifices mothers make are huge but worthwhile.

C．Mothers’ devotion to children can hardly be calculated.

D．Investing time in parenting would bring a financial return.

【小题4】What can we conclude from the study?

A．Mothers，working hours should be largely reduced.

B．Mothers should balance their time for work and rest.

C．Mothers’ labour is of a higher value than it is realised.

D．Mothers should be freed from housework for social life.

同类题5

It is a familiar scene these days: employees taking newly laid-off co-workers out for a drink for comfort. But which side deserves more sympathy，the jobless or the still employed？On March 6，researchers at a conference at the University of Cambridge suggested it was the latter.

Brendan Burchell，a Cambridge sociologist，presented his analysis based on various surveys conducted across Europe. The data suggest that employed people who feel insecure in their jobs show similar levels of anxiety and depression as those who are unemployed. Although a newly jobless person's mental health may“bottom out”after about six months，and then may even begin to improve，the mental state of people who are continuously worried about losing their own job“just continues to get worse and worse”, Burchell says.

Psychologists support this theory by arguing that human beings feel more stressed during times of insecurity because they sense an immediate but invisible threat. Patients have been known to experience higher levels of anxiety, for example, while waiting for examination results than knowing what they are suffering from—even if the results are cancer. It's better to get the bad news and start doing something about it rather than wait with anxiety. When the uncertainty continues, people stay in a nonstop“fight or flight”response, which leads to damaging stress.

But not every employee in insecure industries has such a discouraging view, Burchell says. In general, women get on better. While reporting higher levels of anxiety than men when directly questioned, women score lower in stress on the 12-item General Health Questionnaire, even when they have a job they feel insecure about losing. As Burchell explains,“For women, most studies show that any job—it doesn't matter whether it is secure or insecure—gives psychological improvement over unemployment.”He supposes that the difference in men is that they tend to feel pressure not only to be employed, but also to be the primary breadwinners, and that more of a man's self-worth depends on his job.

【小题1】Why do researchers think the still employed deserve more sympathy?

A．They have to do more work since then.

B．They have no chance to find better jobs.

C．They have to work with inexperienced workers.

D．They constantly worry about losing their jobs.

【小题2】What is most likely to cause a“fight or flight”response?

A．Not having a paid job.

B．Poor job conditions.

C．Not knowing what will happen.

D．Pressure to work longer hours.

【小题3】What will the writer talk about following the last paragraph?

A．Advice on preparing for a job interview.