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2015考研英语模拟题及答案：阅读理解(二)
Being a man hasalways been dangerous. There are about 105 males born for every 100 females,but this ratio drops to near balance at the age of maturity, and among70-year-olds there are twice as many women as men. But the great universal ofmale mortality is being changed. Now, boy babies survive almost as well as girlsdo. This means that, for the first time, there will be an excess of boys inthose crucial years when they are searching for a mate. More important, anotherchance for natural selection has been removed. Fifty years ago, the chance of ababy(particularly a boy baby) surviving depended on its weight. A kilogram toolight or too heavy meant almost certain death. Today it makes almost nodifference. Since much of the variation is due to genes, one more agent ofevolution has gone。
There is another way to commit evolutionary suicide: stay alive,but have fewer children. Few people are as fertile as in the past. Except insome religious communities, very few women have 15 children. Nowadays thenumber of births, like the age of death, has become average. Most of us haveroughly the same number of offspring. Again, differences between people and theopportunity for natural selection to take advantage of it have diminished.India shows what is happening. The country offers wealth for a few in the greatcities a...