牛牛们来看看我的语法题 不明呀

leadership

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

leadership

many  thanks !!!!

victroy

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

piranha

1.that 应该为which作为从句的主语。

fdgggd

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