题目:
—When did you staying up so late?
—When I entered this school two years ago, where students have too much homework to do.
A.take in
B.take on
C.take down
D.take to
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:A、反应类型为复分解反应,符合两种化合物相互交换成分形成另两种化合物的特点,正确,B.反应后得到CuSO4溶液,为蓝色溶液,正确,C、根据化学方程式为Cu(OH)2 + H2SO4 = CuSO4 + 2H2O中...