单项选择题

The water will be further polluted unless some measures ______.

A．will be taken
B．are taken
C．were taken
D．had been taken
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单项选择题
Good technique in medicine means less pain and fewer deaths and, ______ it is our duty to master it.
A．altogether
B．therefore
C．otherwise
D．however
单项选择题
______ but fools will believe what he said.
A．None
B．Nothing
C．Anything
D．Everything
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