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  3. Being a man has always been dangerous. There are about 105 males born for every 100 females , but this ratio drops to near balan

Being a man has always been dangerous. There are about 105 males born for every 100 females , but this ratio drops to near balan

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问题     Being a man has always 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 among 70-year-olds there are twice as many women as men. But the great universal of male mortality is being changed. Now, boy babies survive almost as well as girls do. This means that, for the first time, there will be an excess of boys in those crucial years when they are searching for a mate. More important, another chance for natural selection has been removed. Fifty years ago, the chance of a baby (particularly a boy baby) surviving depended on its weight. A kilogram too light or too heavy meant almost certain death. Today it makes almost no difference. Since much of the variation is due to genes, one more agent of evolution 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 in some religious communities, very few women has 15 children. Nowadays the number of births, like the age of death, has become average. Most of us have roughly the same number of offspring. Again, differences between people and the opportunity for natural selection to take advantage of it have diminished. India shows what is happening. The country offers wealth for a few in the great cities and poverty for the remaining tribal peoples. The grand mediocrity of today—everyone being the same in survival and number of offspring—means that natural selection has lost 80% of its power in upper-middle-class India compared to the tribes.
    For us, this means that evolution is over; the biological Utopia has arrived. Strangely, it has involved little physical change. No other species fills so many places in nature. But in the past 100,000 years—even the past 100 years—our lives have been transformed but our bodies have not. We did not evolve, because machines and society did it for us. Darwin had a phrase to describe those ignorant of evolution; they "look at an organic being as a savage looks at a ship, as at something wholly beyond his comprehension." No doubt we will remember a 20th century way of life beyond comprehension for its ugliness. But however amazed our descendants may be at how far from Utopia we were, they will look just like us.
Our body did not evolve because ______.
选项 A、natural selection has lost its power
B、the biological Utopia has arrived
C、machines and society take our place to evolve for us
D、physical changes have stopped
答案C
解析 根据题干，这个题目定位到最后一段的第五句，本句话说，我们没有进化，这一切都归功于机器的使用和社会的变化。因此，我们知道题目的正确答案是选项C，C是这一句话的同义改写。选项A对应倒数第二段的最后一句话，和题目无关。选项B对应最后一段的第一句话末尾，也是答非所问。选项D对应最后一段的第二句话，虽然同义改写，但同样没有回答题目的问题。
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