One important biological factor that helps women live longer is the difference in hormones between men and women.__2__ 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 the blood flow.In fact

　　__3__ They help the body defend itself against some kinds of infections.This means that women generally get sick less often and less seriously than men.The common cold is a good example: women，on average，get fewer colds than men.

　　__4__ Scientists are still not exactly sure how genes influence aging，but they believe that they do.Some think that a woman's body cells have a tendency(倾向)to age more slowly than a man's.Others think that a man's body cells have a tendency to age more quickly.__5__

　　r，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 various body functions.

　　【语篇导读】　本文是一篇说明文主要介绍了女性比男性寿命更长的原因。

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