广东普高专升本英语（阅读理解）模拟试卷1
常规阅读
Sleep is very ancient. In the electroencephalographic (脑电图的) sense we share it with all the primates (灵长类动物) and almost all the other mammals and birds; it may extend back as far as the reptiles (爬行动物).
There is some evidence that the two types of sleep—dreaming and dreamless, depend on the life style of the animal. Predators (食肉动物) are statistically much more likely to dream than prey, which are in turn much more likely to experience dreamless sleep. In dreaming sleep, the animal is powerfully immobilized (使不动) and remarkably unresponsive to external stimuli. Dreamless sleep is much shallower, and we have all witnessed cats or dogs cocking their ears to a sound when apparently fast asleep. The fact that deep dream sleep is rare among prey today seems clearly to be a product of natural selection, and it makes sense that today, when sleep is highly evolved, the stupid animals are less frequently immobilized by deep sleep than the smart ones. But why should they sleep deeply at all? Why should a state of such deep immobilization ever have evolved?
Perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic (永生的) mammals in general seem to sleep very little. There is, by and large, no place to hide in the ocean. Could it be that, rather than increasing an animal’s vulnerability, Ray Meddis of London University has suggested this to be the case. It is conceivable that animals that are too stupid to be quite on their own initiative are, during periods of high risk, immobilized by the implacable arm of sleep. The point seems particularly clear for the young of predatory animals. This is an interesting notion and probably at least partly true.
1.Predators are________.(B)
A. able to prey even when they are in deep dream sleep
B. more likely to experience dream sleep
C. incapable of preying when immobilized by dreamless sleep
D. good at preying on stupid animals
解析：根据第二段第二句“Predators (食肉动物) are statistically much more likely to dream than prey, which are in turn much more likely to experience dreamless sleep．”可知，食肉动物更容易经历有梦睡眠。故选B。
2.The example of dogs and cats in the second paragraph is intended to________.(C)
A. explain which animals are mammals
B. show the differences between mammals
C. illustrate how shallow dreamless sleep is
D. reveal how smart they are
解析：根据第二段第四句“Dreamless sleep is much shallower, and we have all witnessed cats or dogs cocking their ears to a sound when apparently fast asleep．”可知，无梦睡眠比较浅，猫和狗在睡觉时经常竖起耳朵听声音。由此可推知，列举猫和狗的例子是为了说明无梦睡眠的特点，其他选项与此无关，均可排除。故选C。
3.Compared with dreamless sleep, deep dream sleep is________.(D)
A. not the result of natural selection
B. less likely to appear to primates
C. more protective to the animals
D. at a higher stage of evolution
解析：根据第二段第五句“…when sleep is highly evolved, the stupid animals are less frequently immobilized by deep sleep than the smart ones．”可知，笨拙的动物与敏捷的动物相比，更少有深睡不动的时候。由此可推知，深梦睡眠处于进化的高级阶段。故选D。
4.According to some scientists’ research findings, dolphins seldom sleep because________.(C)
A. of their stupidity
B. of their vulnerability
C. there are possible dangers in the ocean
D. aquatic mammals do not need sleep
解析：根据最后一段第二句“There is, by and l
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