Randy Nelson notes that photosensitive(感光的) cells in the eyes have little to do with eyesight.He says these cells send signals to the area of the brain that controls what has been called the natural sleep­wake cycle.

　　He says there’s a lot of blue in white light.This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness.

　　1．Researchers use hamsters in the experiment because

　　.

　　A．they are similar to humans in dealing with colors

　　B．they are easy to observe and study

　　C．they are sensitive to colors like human beings

　　D．they are active at night and sleep during the day

　　答案　D

　　解析　细节理解题。第二段说，选择仓鼠作为实验对象是因为它们白天睡觉，夜间活动，因此选D。

　　2．What sign shows that the hamsters are depressed?

　　A．They drink less sugary water.

　　B．They don’t sleep well.

　　C．Their eyesight becomes worse.

　　D．Their energy level becomes low.

　　答案　A

　　解析　细节理解题。第四段说，研究人员发现喝糖水最少的仓鼠最为抑郁，因此选A。

　　3．

　　tends to cause hamsters to be depressed.

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