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.Mr. Johnson starts to work very early in the morning and goes on working until late in the afternoon ________a break at midday.

A.with

B.for

C.a(chǎn)s

D.through

 

【答案】

A

【解析】略

 

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Although man has known asbestos (石棉) for many hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent. H.W.Johns, owner of a New York City Supply Shop for roofers, was responsible for the opening of that first mine.
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B
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D. showing the use of asbestos gloves
 62. Which is the most important character of asbestos that the author wants to show us?
    A. It is like thread.                               B. It feels soapy.
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Scientists do not know why the rock can be separated easily into threads, but they have found thousands of uses of this fireproof material, of the so-called “cloth of stone”.

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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 characteristic 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.

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