5注意一些连词。如一些表示转折的连词,but,However,yet,though,nevertheless等,另外还有一些表示并列关系的连词如and,also,aswellas,neithernor,eitheror,notonly...butalso,ononehand....ontheotherhand等。因为这些连词可以表现句子与句子之间的关系,通过不同的连词我们可以推知句子与句子之间不同的关系。卷Both men and women are living longer these days in industrialized countries.
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In general, they can expect to live six or seven years more than men. One reason for this is biological.
One important biological factor that helps women live longer is the difference in hormones between men and women.
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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.
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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.
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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 .
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