答案 D
2.Why do some old people look a little shrunken as they age?
A.Because their spine is in active use.
B.Because they are more easily affected by gravity.
C.Because they keep growing backwards.
D.Because their spine becomes more bent.
解析 细节理解题。根据第四个标题下的“They simply lose height as their spine(脊柱) becomes shorter and more curved due to disuse and the effects of gravity(重力).”可知,老年人变矮是因为脊柱收缩和弯曲造成的。
答案 D
3.Which of the following statements about our brain is true?
A.In the long run,our brain probably works harder than our heart.
B.When our brain senses the spinning,we will feel dizzy.
C.The brains of the other mammals are as complex as those of humans.
D.Our feelings and emotions come from the most developed area in our brain.
解析 细节理解题。根据第二个标题下的第三句“But,in the long run,your brain...”可知答案为A项。此题最易误选B项,根据第五个标题下的最后一句可知,眩晕是由于 “你已经不动了,而你的大脑认为你还在动”的错觉引起的。
答案 A
4.What is the main purpose of the selection?
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