在植物蒸腾作用的实验中，选取两种植物上两株大小相同的枝条，依下面A图所示的方法进行处理．实验开始时，a、b两实验装置的重量都是80g，其后每隔一段时间记录两个装置的重量变化，得到下面B图所示的实验结果．上述实验表明，植物进行蒸腾作用的主要器官是（    ）

    Mr. Zhang and Mr. Wang work in the same office. They're good friends.Mr. Zhang says to Mr. Wang in the office,“I would like to have a small party in my home on Sunday evening. Would you and your wife like to come?”

    Mr. Wang says,“Thanks a lot. I'd like to. Let me tell my wife about it.”So Mr. Wang goes to the other office and calls his wife. About half an hour later, he comes back and looks very worried.

    “What's up?” asks Mr. Zhang,“Is your wife at home?”

    “No,” says Mr. Wang.“She isn't at home now , but my little daughter is in .My little daughter says her mother goes out to look for her.”

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