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如图是人体心脏结构图，请据图回答下列问题 （1）用图中的序号回答：心脏主要由肌肉组织组成，分为四个腔，其中肌肉最发达的是______所示的结构，在血液循环中，肺部的血液经______回流入左心房，全身各处的血液经______和______回流入右心房． （2）瓣膜具有防止血液倒流的作用，心房与心室之间的瓣膜______，心室与动脉之间的瓣膜______．
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【简答题】阅读理解。 Have you  ever  been  to  the  Great  Wall  of  China? Every year there are many people visit it and the visitors find it is very  pleasant in visiting the  Great Wall.  The  Great Wall  of  Chi...
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【简答题】阅读理解。 Have you  ever  been  to  the  Great  Wall  of  China? Every year there are many people visit it and the visitors find it is very  pleasant in visiting the  Great Wall.  The  Great Wall  of  Chi...
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查看完整题目与答案
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B.
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查看完整题目与答案
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查看完整题目与答案
【简答题】The Great Wall of China has a history of more than two thousand years. It 1 from the east to the west in North China. It is often called “The Ten-thousand- Li Great Wall” by the Chinese people. The Gr...
查看完整题目与答案