单项选择题

As one of the youngest professors in the university, Miss King is certainly on the （）of a brilliant career.

A．edge
B．porch
C．threshold
D．course

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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
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
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