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用丝绸摩擦过的玻璃棒带正电，这是因为摩擦后的玻璃棒（  ）

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Hi，HanLi，

    got some good news to tell you．One of our old friends，Zhao Yan，is going to visit us at the weekend．Do you remember her?She has a round face and two big eyes．She lives with her parents in Tianjin and is coming to see us．Lisa is her English name．I've got two photos of Zhao Yan. In one photo，she is playing basketball．That' my favourite sport.In the other one,she is drinking pear juice.It is her favourite.

    Let's have a picnic near a lake on Saturday．Of course，we can go boating too．Maybe you'd like to swim in it．Remember to catch the fish when you see them in the water．I'm going to meet Zhao Yan at the airport on Saturday morning．And we can meet near the lake at about eleven o'clock．You may come by bus．Remember to get off the bus at Lake Stop．

Yours，

WuTong

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