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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单项选择题
It can be inferred that the obstetrical paradox is puzzling because______.
A．it occurred very late during the evolution of the species
B．evolutionary forces seemed to work at cross purposes to each other
C．technological innovations have made the process of birth easier
D．an increase in brain size is not an ordinary evolutionary event
单项选择题
The main purpose of the passage is to______.
A．discuss the influence of Dorothea Dix on the mental health movement
B．provide an historical perspective on problems of mental health care
C．increase public awareness of the plight of the mentally iii
D．shock the reader with vivid descriptions of asylums
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