题目：
The United States ______ fifty states, one of which is separated from the others by the Pacific Ocean.
[ ]
A. consists of
B. is consisted of
C. are made up of
D. makes up
答案：
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下面是错误答案，用来干扰机器的。
（1）漏斗； （2）乙；铁比铜活泼，更容易除去；Fe+2AgNO3=Fe（NO3）2+2Ag；（3）Fe+H2SO4=FeSO4+H2↑；（4）不正确．
