concentrate（）

填空题

concentrate（）

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单选题

Please concentrate on the business at hand and don’t drag in ___________ issues.

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材料题

鼓). The noise level in some disco is far above the usual safety level for heavy industrial areas. One recent report about noise and concentration(专心,) suggested that although a lot of people say that any noise disturbs their concentration, what really affects their ability to concentrate is a change in the level of noise. It goes on to say that a background noise, which doesn′ t change too much (music, for example) lnay even help people to concentrate. From this passage, the pollution of noise

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