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
Do you have any ______ about what living beings on other planets would be like
A．ideal
B．comprehension
C．notion
D．intelligence
单项选择题
During their first teacher training year, the students often visited schools for the ______ of lessons.
A．observation
B．investigation
C．inspection
D．examination
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