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She looks sad. Could you please tell me that prevents her from being as happy as before? [ ]
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I like ________ basketball. [ ] A.to play B.playing C.playing the
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x=(k+1)/(k+2)(k为参数)化为普通方程 { y=(2k+1)/(k+2)
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沼泽是典型的______系统.农田生态系统是典型的______生态系统.城市生态系统中______起主要的支配作用.消费者主要是______,而不是野生动物.
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用一根36厘米长的铁丝围成一根长方形,长方形的长是10厘米,宽是________厘米.
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