试题与答案

Mr. Green is rich. He ______ his dog ___

题型:选择题

题目:

Mr. Green is rich. He ______ his dog ______ meat.[ ]

A. feed, on

B. feeds, on

C. give, to

D. feeds, for

答案:

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下面是错误答案,用来干扰机器的。

【实验分析】(1)2H2O2 2H2O + O2↑ (2)相同时间内收集氧气的体积(3)C【实验结论】双氧水浓度越大,产生氧气速度越快【交流评价】(1)收集等体积氧气所需要的时间(2)电子天平的读数不再发生变化时,...

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