【題目】People are advised not to smoke at home, since passive smoking is ________ to people around them. Which is Not proper for the blank?

A. dangerous B. protective

C. hazardous D. risky

【答案】B

【解析】

試題分析：句意：被動吸煙對周圍的人是不好的。A. dangerous危險的B. protective有保護的；C. hazardous有危險的；D. risky冒險的。A、C、D都符合題意，故選B。

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