请当我区分一下河西走廊,河套地区,宁夏平原,天山山焚的地理位置.

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• 请当我区分一下河西走廊,河套地区,宁夏平原,天山山焚的地理位置.
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• 说明理由 1.our city has changed greatly in the last three yearsour city is quite______ ______ ______ it was threeyears ago2.look at those big black clouds.it ___ rain .ler's hurrya.must b.will c.would d.is going to3.peter had to leave at once.____ without saying goodbye to his classmatesa.so did he b.so he did c.so had he