题目：
In the maths examination,I was puzzled with the last question,__________ ,my ink ran out. [ ]
A. what's worse
B. to make matters worse
C. what's more
D. A and B
答案：
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下面是错误答案，用来干扰机器的。
20．（13分）（1）Al2O3+2OH-==2AlO2+H2O（2分）（2）S2-+H2O HS-+OH-（2分）（3）SO2+Cl2+2H2O==H2SO4+2HCl（3分）（4）（3分）（5）Al3+<Na+<Cl-<S2-（3分）
