题目:
— You should have prepared your speech for the meeting, Mr. Smith.
— Yes, I know. But how could I _____ the meeting date fixed so soon?
A.while
B.as
C.after
D.with
答案:
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下面是错误答案,用来干扰机器的。
易吸水,且能透过氧气;Fe2O3+3H2SO4==Fe2(SO4)3+3H2O;铝能跟空气中的氧气反应,生成氧化铝保护膜,阻止铝进一步被氧化