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单选题 公共英语三级
2018-02-07

According to Isabel,it is important to__________.

A.look for jobs with little stress
B.look for jobs with great benefits
C.be truthful in declining job offers
D.be cautious in declining job offers

参考答案

C

答案解析

推断题。从文章第三段第三句“However,they apprecia-ted her frankness and thanked her for her honesty.”可知,虽然伊莎贝尔拒绝了这两份工作,但是他们都很欣赏她的坦白和真诚。C项“选择工作时要坦诚”符合题意,故选C。

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1 根据下面资料,回答题。
You do not usually get something for nothing. Now, a new study reveals that the evolution of an improved learning ability could come at a particularly high price: an earlier death.
Past experiments have demonstrated that it is relatively easy through selective breeding to make rats, honey bees and--that great favourite of researchers--fruit flies a lot better at learning. Ani-mals that are better learners should be competitive and, thus, over time, come to dominate a popu-lation by natural selection. But improved learning ability does not get selected amongst these ani-mals in the wild. No one really understands why.
Tadeusz Kawecki and his colleagues at the University of Fribourg in Switzerland have meas-ured the effects of improved learning on the lives of fruit flies. The flies were given two different fruits as egg-laying sites. One of these was laced with a bitter additive that could be detected only on contact. The flies were then given the same fruit but without an additive. Flies that avoided the fruit which had been bitter were deemed to have learned from their experience. Their children were reared and the experiment was run again.
After repeating the experiment for 30 generations, the children of the learned flies were com-pared with normal flies. The researchers report in a forthcoming edition of Evolution that although learning ability could be bred into a population of fruit flies, it shortened their lives by 15%. When the researchers compared their learned flies to colonies selectively bred to live long lives, they found even greater differences. Whereas learned flies had reduced their life spans, the long-lived flies learned less well than even average flies.
The authors suggest that evolving an improved learning ability may require a greater investment in the nervous system which takes resources away from processes that delay ageing. However, Dr.Kawecki thinks the effect could also be a by-product of greater brain activity increasing the produc-tion of Reactive Oxygen Species ( ROS), which can increase oxidation in the body and damage health.
No one knows whether the phenomenon holds true for other animals. So, biologists, at least,still have a lot to learn.
Past experiments prove selective breeding can make animals better__________.
A.commanders
B.competitors
C.survivors
D.learners
A.some flies avoided the fruit without an addictive
B.some flies preferred the fruit with an addictive
C.the eggs of the flies were not damaged
D.the impact on the flies did not last long
A.long-lived flies are better at laying eggs
B.long-lived flies are poorer in learning
C.learned flies have a relatively long life
D.learned flies live as long as average ones