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 there are two reasons.

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 loss of his（）of hearing didn't stop him f~om being a useful member of the society.

A. faculty
B. ability
C. capability
D. power
单项选择题
This crop does not do well in soils（）the one for which it has been specially developed.

A. outside
B. other than
C. beyond
D. rather than
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