单项选择题

The author is most probably addressing which of the following audiences

A．Medical students in a course on human anatomy.
B．College students in an introductory course on archaeology.
C．Psychologists investigating the uses of human immaturity.
D．Biologists trying to trace the course of human evolution.
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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
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
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