- [材料题] 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 favorite of researchers-fruit flies a lot better at learning. Animals that are better learners should be competitive and, thus, over time, come to dominate a population by natural selection. But improved learning ability does not get selected amongst these animals in the wild. No one really understands why. Tadeusz Kawecki and his colleagues at the University of Fribourg in Switzerland have measured 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
- 单项选择题1.Past experiments prove selective breeding can make animals better_______
A、Commanders
B、Competitors
C、survivors
D、learners
- D
关注下方微信公众号，在线模考后查看
- 单项选择题2.In this experiment, scientists observed that________
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
关注下方微信公众号，在线模考后查看
- 单项选择题3.The forthcoming report says that_______
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
- B
关注下方微信公众号，在线模考后查看
- 单项选择题4.According to Dr.Kawecki, greater brain activity______
A、reduces oxygen consumption
B、regulates the nervous system
C、speeds up the ageing process
D、stabilizes the ageing process
- C
关注下方微信公众号，在线模考后查看
- 单项选择题5.We learn from the text that_______
A、the research findings need to be tested further
B、biologists are doing similar research on other animals
C、the animal world usually follows the same universal laws
D、biologists are applying their findings to other areas
- A
关注下方微信公众号，在线模考后查看