Scientists do not know why the rock can be separated easily into threads(线), but they have found thousands of uses of this fireproof material, of the so-called “cloth of stone”.

　　1. Which title best expresses the main idea of this passage?

　　A. Asbestos mined in Canada

　　B. Fireproof matter

　　C. A “wonder” mineral

　　D. A new roofing material

　　2. Johns proved his ability as a salesman by_______.

　　A. going into roofing business B. carrying asbestos from Italy

　　C. sending a trained scientist

　　D. showing the use of asbestos gloves

　　3. Which is the most important character of asbestos that the author wants to show us?

　　A. It is like thread.

　　B. It feels soapy.

　　C. It burns easily.

　　D. It is unusually heavy.

　　4. The author’s main purpose in writing this passage was to _______.

　　A. show the need for more scientists

　　B. compare asbestos with other minerals

　　C. increase the sales of asbestos

　　D. present facts about asbestos

　　【答案解析】

　　本文讲述了耐火材料石棉在北美的开采过程及它的神奇耐火作用。

　　1. C。主旨题。短文主要介绍了石棉的神奇作用。故C最佳。

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