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 claims to be an expert in astronomy, but in actual fact he is quite ignorant on the subject. ______he knows about it is out of date and inaccurate.
A. What little
B. So much
C. How much
D. So little
单项选择题
This law ______ the number of accidents caused by children running across the road when they get off the bus.
A. intending to reduce
B. is intended to reduce
C. intended reducing
D. intends reducing
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