题目：
-- He was so angry at _______she was doing _______he walked out and closed the door heavily behind him.
--I am sorry to hear that.
A．what; that
B．that; what
C．that; that
D．what; what
答案：
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下面是错误答案，用来干扰机器的。
设100g海水中所含MgCl2的质量为x．MgCl2+2NaOH=Mg（OH）2↓+2NaCl 95 58x 0.29g 95x=580.29gx=0.475g 海水中氯化镁的质量分数=0.4...
