单项选择题

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

A．what it does
B．what it is
C．why it does
D．why it is
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单项选择题
He spoke so ______ that even his opponents were won over by his arguments.
A．bluntly
B．convincingly
C．emphatically
D．determinedly
单项选择题
She gave ______ directions about the way the rug should be cleaned.
A．explicit
B．brisk
C．transient
D．opaque
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