单项选择题

Clark felt that his（）in one of the most dramatic medical experiments of all time was worth the suffering he underwent.

A. apprehension
B. appreciation
C. presentation
D. participation

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单项选择题
The governor’s ______ remarks caused his political party much embarrassment.
A. forceful
B. impromptu
C. rehearsed
D. unrestrained
单项选择题
Most visitors to that peninsula find the breathtaking scenery, which features the sea and rocks, a great （）

A. threat
B. thrill
C. thriving
D. thrift
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