单项选择题

The opening ceremony is a great occasion. It is essential _______for that.

A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared
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单项选择题
In today’’s medical, little agreement exists on the______ for defining mental illness.
A．legislation
B．requirement
C．criteria
D．measures
单项选择题
Hellen Keller’’s ______ over deafness, blindness, and muteness was a miracle.
A．improvement
B．success
C．advance
D．triumph
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