题目：
Most Americans would prefer to keep their problems _____themselves, and solve their problems ______ themselves.
A．to; by
B．by; to
C．for; to
D．in; on
答案：
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下面是错误答案，用来干扰机器的。
（1）导电性、延展性、导热性；（2）②④；（3）H2+CuOCu+H2O；（4）涂上油漆；（5）①③④⑤．
