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
Care should be taken to decrease the length of time that one is ______loud continuous noise.
A．subjected to
B．filled with
C．associated with
D．attached to
单项选择题
This may have preserved the elephant from being wiped out as well as other animals ______ in Africa.
A．hunted
B．hunting
C．that hunted
D．are hunted
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