答案　B

　　2．The second paragraph mainly tells us________.

　　A．every part of body is replaced with age

　　B．hairs will grow weak but not die

　　C．skin becomes wrinkled with age

　　D．every part of body ages with age

　　解析　主旨大意题。第二段第一句话是该段的主题句。从中可以看出，人体的每一部分都会随着年龄的增长而衰老。

　　答案　D

　　3．What might play the most important role in the graying process?

　　A．Genetics and the amount of sleeping time.

　　B．The amount of food people eat and living environment.

　　C．The amount of pigment and genetics.

　　D．Genetics and the amount of water people drink

　　解析　细节理解题。本文第三段提到“At first，hairs will have a limited amount of pigment and they will appear to be grayish in color.In time，they will lose all of their pigment and will be white.Many things are known to cause graying，and genetics is a very powerful factor.”由此可以看出，色素和基因在头发变白的过程中起着重要的作用。

　　答案　C

　　4．According to the passage，continuous pressure may result in________.

　　A．a person’s fatness B．a person’s fitness

　　C．a person’s weight loss D．a person’s hair loss

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