单项选择题

What used to be the danger in being a man according to the first paragraph

A．A lack of mates.
B．A fierce competition.
C．A lower survival rate.
D．A defective gene.
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单项选择题
The author seems to believe the revival of the U.S. economy in the 1990s can be attributed to the ______.
A．turning of the business cycle
B．restructuring of industry
C．improved business management
D．success in education
单项选择题
The loss of U.S. predominance in the world economy in the 1980s is manifested in the fact that the American ______.
A．TV industry had withdrawn to its domestic market
B．semiconductor industry had been taken over by foreign enterprises
C．machine - tool industry had collapsed after suicidal actions
D．auto industry had lost part of its domestic market
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