单项选择题

The underlined word "blurred" in the 3rd paragraph most probably means ______.

A．confused
B．demonstrated
C．exposed
D．revealed
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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
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
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