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3.D【命题意图】本题以分子结构理论为背景,考查分子力、分子力做功与分子势能等知识,意在考查考生的理解能力和推理论证能力。【解析】当分子间距离r=。时,分子力为0,当分子间距离r
第四部分写作第一节短文改错It was November 21,myparentsparentswedding anniversary.But wehavehadjust buried my father the week before.FeltFeelingdown,I ran into the bank to cash a check.The teller coun-ted mychanges.“Wow,”he said.“This penny is fromchange1951."That was the yearwhatwhenmy parents married.I sawit was a wheat penny.My sweet dad was A coin collector.aSheHehad jars full of wheat pennies.If the teller had notShe had jars full of wheat pennies.If the teller had notHebeen mentioned it,I would have spent that pennywithwithoutsecond thought.But now I willpermanentpermanentlyvalue my pennyfrom heaven.