2017届高考北师大版英语二轮复习单元限时规范练：必修2 Unit 6《design》（含解析）_高考复习指南

　　7．What's the best title of the passage?

　　A．Chemicals are everywhere

　　B．Chemicals can lead to cancer

　　C．What is in chemicals in our daily life?

　　D．Mixture of safe chemicals may cause cancer

　　答案：D　主旨大意题。根据第一段中的几个问题“are they still ‘safe’ if mixed with other chemicals? That's the big question.”可知。

　　8．What can be inferred from the passage?

　　A．Harmful chemicals are throughout our homes.

　　B．Scientists know which mixture does harm to our health.

　　C．Researchers have quick approaches to studying the chemicals.

　　D．It is hard to tell what mixture of chemicals is harmful.

　　答案：D　推理判断题。根据文章最后一段，专家所描述的“...what groups of chemicals, when together, would produce more harmful effects.

　　And at the moment, that is not known.”可知答案。

　　1．surround vt. 包围；围绕

　　2.mixture n. 混合物

　　3．avoid vt. 避免；逃避

　　4.identify vt. 辨别

　　5．harmful adj. 有害的

　　1．in combination with 与……结合

　　2．look out for 当心；提防

　　原文：All 85 are said to be common in the environment. (据说/报道……)

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