题目：
--- Kathy, you’ve got a chance to deliver a speech at the conference?
--- Yes, 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。
铁锈被除去；溶液变成黄色；铁钉表面产生气泡；Fe2O3+6HCl==2FeCl3+3H2O；Fe+2HCl==FeCl2+H2↑
