题目内容

The mother told the little boy to do all the things _______.

A. on himself
B. on his own
C. to himself
D. by own

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It ______ that 200 people died and over 5,000 lost their shelters after the flood．

A. reported
B. reports
C. has been reported
D. has reported

It was _______ who helped Tom out when he was in trouble.

A. I
B. me
C. us
D. ours

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K₂Cr₂O₇标准溶液的浓度为0.02000mol·dm^-3，则它对Fe，Fe₂O₃，FeSO₄·7H₂O的滴定度分别为g·cm^-3，g·cm^-3，__g·cm^-3。