问题
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According to the passage, which of the following is true of acid rain?A.Tree leaves die of
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The loss of the rain forests would upset the climates of tropical countries, bringing drou
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The lack of rain______the already serious shortage of food.A.aggregatedB.aggravatedC.agita
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What is the main topic of the passage?A.The mechanics of rain.B.The climate of North Ameri
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______ studies the sound system of language and the functioning of the speech sounds.A.Pho
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Parents can not hear the sound of the sleighbell.()
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