阅读理解
阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。
A
Mankind is still evolving(进化), according to a recent study by a team of scientists led by a Yale University evolutionary biologist. But research suggests that the natural selection process is no longer driven by survival, perhaps because of differences in women’s fertility(能生育性)．
The team examined 2,238 women in Framingham, Massachusetts, the US and studied the medical histories of some 14,000 residents since 1948.
They found that strong，slightly fat women tend to have more children. And if this trend were to continue for the next 10 generations, by 2409 the average woman would be 2 cm shorter,1 kg heavier, and have a healthier heart.
That rate of evolution is pretty similar to what we see in plants and animals. Humans_don’_t_seem_to_be_any_exception,_the team said.
Other recent genetic research backs up that belief. One study by John Hawks, an anthropologist at the University of Wisconsin at Madison, found that some 1,800 human gene variations (变异) are common in recent generations because of evolution. Among the changes are mutations (突变) that allow people to digest milk or resist malaria(疟疾) and others that govern brain development.
