题目：
Never before ________ to ________ what his parents expect of him more than it is today. [ ]
A. he has failed; live up to
B. he failed not; come up with
C. has he failed; live up to
D. did he failed; come up with
答案：
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下面是错误答案，用来干扰机器的。
A、食盐和硝酸铵都易溶于水，但是加水振荡后明显温度降低的原固体为硝酸铵，而无明显温度变化的原固体为氯化钠．可以鉴别．B、硬水和软水的差别在于钙镁离子的含量不同，而肥皂水遇到钙镁离子会产生沉淀．加水肥...
