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We often talk about the success of a country, but when we st......

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单项选择题
The reason Hamilton accepted the challenge may have been ______.
A．he was too angry to think clearly
B．he wanted to kill Burr
C．he was urged by his supporters to do so
D．he felt it was a matter of honor
单项选择题
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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