17 Between the ages of about 12 and 50, women produce hormones that are involved in fertility(生育能力). These hormones also have a positive effect on the heart and blood flow. In fact, women are less likely to have high blood pressure or to die from heart attacks.
18 They help the body defend itself against some kinds of infections. This means that women generally ger sick less often and less seriously than men. The common cold is a good example: women, on average, get fewer colds than men.
19
Scientists are still not exactly sure how influence aging, but they believe that they do. Some think that a woman’s body cells have a tendency(向) to age more slowly than a man’s.Others think that a man’s body cells have a tendency to age more quickly . 20 A.However, women, on average, live longer. B .The biological factor plays an important part. C. Women are also helped by their female genes. D. The female hormones also protect the body in another way. E. Recent research seems to support both of these possibilities. F. Therefore, women are more healthy than men and can live a better life. G. Hormones are chemicals which are produced by the body to control carious body functions.
【解析】
16. A根据空格下一句“一般说,女性比男性多活6到7年”可知此处的意思是:然而,女性平均比男性寿命更长。故选A。
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