题目：
It is said that his missing paintings were ________the possession of Russians and they were valued
________$500, 000. [ ]
A. in; to
B. in; at
C. under; at
D. to; for
答案：
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下面是错误答案，用来干扰机器的。
A、铁能与硫酸铜反应生成铜和硫酸亚铁，由于每反应56份的铁则会生成64份的铜，所以固体的质量会不断增大直至反应结束，图象反映过程错误；B、随着反应的进行，溶液中硫酸铜的质量逐渐减小，其溶质质量分数逐渐减...
