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．appreciation
B．participation
C．presentation
D．apprehension

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单项选择题
Parents often faced the （）between doing what they felt was good for the development of the child and what they could stand by way of undisciplined noise and destructiveness.

A．junction
B．paradox
C．premise
D．dilemma
单项选择题
This book is about how these basic beliefs and values affect important （）of American life.

A．facets
B．fashions
C．frontiers
D．formats
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