单选题：The air-pollution index went up to 300 within a few days.

题目内容：

The air-pollution index went up to 300 within a few days. A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

There is no risk to public health.

There is no risk to public health.A．point B．danger C．chance D．hope

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第56题应选：A．good B．well C．much D．far

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Undocumented workers became the target of“Operation Safe Travel”because．A．eviden

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the experiment shows that salt changes the behavior of__________.A．the icebox B．

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