2022 英语周报 九年级 新目标实验 31答案

Possible version:Tom thought for a moment and was about to agree, but he changed his mind. " I can't, BenYou know Aunt Polly wants the fence to be perfect. It has to be done very carefully.I don'tthink you can do it well enough. "He said to Ben, who looked a little discouraged. "Oh, Tom, I'llbe careful. Please let me have a try I would like to give you my apple if you agree, "requestedBen In the end, Tom gave up the brush with unwillingness on his face, but joy in his heartWhile ben worked at the fence in the hot sun Tom sat under a tree, eating the apple, andlanning how to get more help. many of his other friends walked past him. Each one came topllaugh, but remained to whitewash the fence because they all got interested in it. One by one, theywhitewashed the fence, each giving Tom a reward, big or small. If he hadn't run out ofwhitewash, Tom would have owned everything belonging to his friends. He had a most wonderful andidle Saturday, sitting in the shade and enjoying the rewards that his friends gave him

16.D【解析】充电时,能量转化形式主要为热能转化为化学能,A项错误;该电池的工作原理为左池溶液中发生反应Cu2++4NH3=[Cu(NH)4]2+,导致溶液中Cu2浓度降低,从而形成浓差电池,左侧Cu电极为负极,电极反应式为Cu+4NH3-2e==[CuNH3)42+,B项错误;要形成稳定的浓差电池,a应选择阴离子交换膜,C项错误;放电时,左池Cu电极减少6.4g时,转移0.2mol电子,右池电解质溶液中有6.4gCu2+得电子生成Cu,同时电解质溶液中有0.2 mol No3通过离子交换膜进人左池,质量减少12.4g,故右池溶液质量共减少188g,D项正确。

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