单项选择题

What may happen if we cannot hear ourselves think

A．We may forget what we have thought about.
B．Our thoughts may be disturbed.
C．Our mind may be harmed.
D．We may have difficulty finding the right words.

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单项选择题

Why are scientists surprised by the findings in their noise study

A．Because the world is becoming more and more noisy.
B．Because they have learned that noise is also a kind of pollution.
C．Because noise is an unwanted waste for human beings.
D．Because people knew little about noise befor

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She didn't want to buy it, ______.

A．however good was it
B．however good it was
C．for how good might it be
D．for how good it might be