单项选择题

If you are always______ by uncertainty in doing anything, you'll come to nothing.

A．broken down
B．weighed down
C．turned down
D．pulled down
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单项选择题
It's the company's conviction that its business will be expanded rapidly, though it is at a rather______ level now.
A．modest
B．mild
C．minor
D．minimum
单项选择题
The magician picked three persons______ from the audience and asked them to help him with the performance.
A．by accident
B．on occasion
C．at random
D．on average
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