5．G　[空格后一句中提及pleasure和fear，是从正反两方面进行对比，对应G项中的differently，再根据空格后一句中出现的risk－seeker，brain，us等词与选项G中的nervous situation，our brains相对应，故选G项。]

　　Passage 2　(2016·四川)

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　Both men and women are living longer these days in industrialized countries.__1__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.__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, women are less likely to have high blood pressure or to die from heart attacks.

　　__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 mans.Others think that a man’s body cells have a tendency to age more quickly.__5__

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