单项选择题

Staying alone in the house she was （） when she heard someone knocking at the door.

A．startled
B．afraid
C．feared
D．frightened

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单项选择题
If you want to get the job, firstly, you should have a (n) （） examination.

A．introductory
B．possible
C．primary
D．preliminary
单项选择题
It is reported that there in no better （） for human's hands.

A．alternative
B．equivalence
C．exchange
D．substitute
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