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阅读理解。 Although man has known asbestos 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 (对…负责) the opening of that first mine. Mr. Johns was given a piece of asbestos which had been found in Italy. He experimented with the materialand then showed its surprising powers to his customers. After putting on a pair of asbestos gloves, whichlooked much like ordinary work gloves, he took red-hot coals from the fireplace and played with them in his hands. How astonished the customers were to discover that he was not burned at all.You can well imagine thathe had increasing business in asbestos roofing materials. However, because it was very expensive to transport (carry) them from Italy to the United States, Mr. Johns sent out a young scientist to seek a source nearer home.This young man found great vein (岩脉), in the province of Quebec in Canada. Ever since 1881 Quebec has led the world in the production of this unusual mineral, which is made up ofmagnesium, silicon, iron, and oxygen.When it is mined, the asbestos is heavy, just as you would expect a mineral to be. When it is separated, a strange thing happens; the rock breaks down into fine, soft, soapy fibres (纤维). Scientists do not know why the rock can be separated easily into threads (线), but they have foundthousands 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

题目标签:岩脉纤维
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【单选题】纤维属于 ( )。

A.
薄壁细胞
B.
厚角细胞 
C.
石细胞
D.
厚壁细胞

【单选题】莱卡是指()纤维。

A.
聚酯纤维
B.
聚丙烯腈纤维
C.
聚氨酯纤维
D.
聚乙烯醇纤维

【单选题】形成螺旋状纤维的是

A.
F-肌动蛋 白
B.
肌球蛋白
C.
原肌球蛋白
D.
α-辅肌动蛋白
E.
G-肌动蛋白

【单选题】支配咀嚼肌的纤维起于

A.
面神经核
B.
三叉神经中脑核
C.
三叉神经脑桥核
D.
三叉神经脊束核
E.
三叉神经运动核

【单选题】Sharpey纤维是指()。

A.
一端埋在牙槽骨,一端埋入牙龈
B.
一端埋在牙槽骨,一端埋入牙骨质
C.
一端埋在牙槽骨,一端埋入牙周膜
D.
一端埋入牙骨质,一端埋入牙周膜
E.
一端埋入牙髓,一端埋入牙龈

【单选题】肺纤维引起的是()

A.
肝浊音界上移
B.
肝浊音界下移
C.
肝浊音界消失
D.
肝浊音界扩大
E.
肝浊音界缩小