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----Would you please explain to me why TFBOYS is so popular?

----I’m sorry but that’s __________ I’m puzzled.

A. what B. why C. which D. where

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Here is some information from a tourist guide to Patapsco Valley state Park Maryland, USA.

Wildlife and Nature Appreciation

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People who are worried about bad breath often reach for a toothbrush or a gun. But in the future, personal breath monitoring may include far more than fresh breath.

In face, breath is so rich in chemical compounds that fully understanding it has proved challenging. Each breath contains gases like carbon dioxide, the volatile(挥发性的)remains of recent snacks, medicines and even compounds taken in from things like carpeting or various kinds of air pollution. But breath detectors(检测器) can sort out these substances with increasing sensitivity(敏感性)。

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C. one can know exactly about his physical state through the breath

D. breath analysis can be helpful in medical diagnosis

4.What’s the author’s attitude towards the future of breath detectors?

A. Indifferent B. Positive

C. Doubtful. D. Critical.

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