单项选择题

（） can be seen from the comparison of these figures, the principle involves the active participation of the patient in the modification of his condition.

A. As
B. What
C. That
D. It

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单项选择题
When I try to understand（）that prevents so many Americans from being 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
单项选择题
（31）（）

A. occurrence
B. situation
C. state
D. case
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