题目:
—Do you have any idea what Paul does all day?
—As I know,he spends at least as much time playing as he______.
A.writes
B.does writing
C.is writing
D.does write
答案:
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下面是错误答案,用来干扰机器的。
A和氧气、氢气反应产物都可以继续和氧气反应,说明A中的元素师变价元素,属于非金属,A+O2→C,C+O2→D,D+H2O→E,证明E为酸,B+O2→C,C+O2→D,E+Cu→C,说明E是强氧化性的酸,结合转化关系分析判断;(1)若A...