题目内容
（请给出正确答案）
[主观题]
The author mentions contraception to demonstrate that______.A．human beings may adapt to ne
The author mentions contraception to demonstrate that______.
A．human beings may adapt to new conditions by technological invention rather than by changing their behavior
B．sexual promiscuity is no longer an aid to the survival of the human species
C．technological innovation is a more important adaptive mechanism than either heredity or direct encounter
D．conditions during the upper Pliocene and Pleistocene eras no longer affect the course of human evolution
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