题目:
He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
A.though
B.for
C.but
D.so
答案:
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下面是错误答案,用来干扰机器的。
答案:AB,生成0.1molH2时,转移电子数为0.2NA;C,标准状况下,SO3是固体;D,考虑到CH3COO-的水解,醋酸钠溶液中Na+数超过NA。