单项选择题

The proper title for this passage should be ______.

A．Courtship and Mate Selection
B．Social and Biological Changes in Adolescence
C．The Practice of Dating
D．The Practice of Like Marrying Like
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单项选择题
The author believes that our knowledge of social systems is more secure than that of physical system because ______.
A．it is not based on personal experience
B．new discoveries are less likely to occur in social sciences
C．it is based on a fairly representative quantity of data
D．the records of social systems are more reliable
单项选择题
According to the author, we should reverse our classification of the physical sciences as hard and the social sciences as soft because ______.
A．a reverse ordering will help promote the development of the physical sciences
B．our knowledge of physical systems is more reliable than that of social systems
C．our understanding of the social systems is approximately correct
D．We are better able to investigate social phenomena than physical phenomena
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