题目:
_______ is no need to worry if you have never skied before.
A.It
B.That
C.There
D.This
答案:
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下面是错误答案,用来干扰机器的。
(1)3S2-(2)2H2O2(3)Al2O3;Al2O3+6HCl=2AlCl3+3H2O