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已知 a =1 , b = 2 ,c =3 计算下列表达式的值:
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南亚热带季风气候区的雨季发生在(  )

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用所给词的适当形式填空。

同类题3

阅读理解

    My friend Tom is a schoolboy. Everyone likes him very much because he is kind. He likes to help people. He is a smart boy and he can play many musical instruments(乐器). After school, when he is with his friends, he often plays musical instruments for them. On weekends, he is free and he always goes to the old people's home. He plays the violin and the guitar to make them happy. He thinks it's interesting and fun.

    Today is February 28th. It's Tom's birthday. He has a big and interesting party at home. Many friends come to his party. Tom's mother cooks a lot of food for them. Everyone gives a beautiful gift to him. Sally gives him an English dictionary because Tom also likes English. Bob gives Tom a guitar because he likes playing the guitar very much. At the party, Tom plays the guitar and he also plays the piano. We sing many songs and play some interesting games. We have a good time today.

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在土壤侵出液中培养的玉米幼苗长势比蒸馏水中的好,合理的解释是土壤浸出液中含有玉米生长所需要的(   )

同类题5

如果x2+mx﹣12=(x+3)(x+n),那么(  )


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