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牛牛们来看看我的语法题 不明呀

1.        Ozone is (an) unstable, (faintly) bluish gas (that) is the most (chemical) active form of oxygen. 答案是 C    不明白呀   

2.        The applications of electronic controls made____ by the microprocessor and computer storage have multiplied the uses of the modern typewriter.
A .it possible  B. possible  C. it is possible  D. possibility

答案是B    A 为什么不对呀?

3.    Indigo is a vat color, ____ called because it does not dissolve in water.
A which it      b it is     c  but    d so
答案是D   真是难明白 我觉得C 是对的?

4.     Most of ___ archaeologists know about prehistoric cultures is based on studies of material remains.
A these   b what    c which   d their
答案是B   我选择的是C
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many  thanks !!!!

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答案没有错吧?1.which既引导定语从句又做主语.

2.应该是made the applications of electronic controls possible,所以不用it。

3.so called 省略用法

4.what既做宾语又引导主语从句

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1.that 应该为which作为从句的主语。

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The answer of No.1 should be D.
chemical----chemically (adv) to modify active (adj)

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