单项选择题

When I try to understand ______that prevents so many Americans from being as happy as one might expect, it seems to me that them are two masons.

A. why it does
B. what it does
C. what it is
D. why it is
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单项选择题
The end of men’s lavish attention to fashion marks
A．great political and social changes.
B．aristocracy.
C．social ranks.
D．the great renunciation.
单项选择题
A．traceB．trailC．paceD．track
A．trace
B．trail
C．pace
D．track
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