1.the(最高级名词短语前面用定冠词）
2.不填(measures表示手段,不用特指）
Air pollution is___most serious problem in many major cities
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相关问题
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Air pollution is___most serious problem in many major cities
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（ ）the air pollution is the most serious problem .We should
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why air pollution is the most serious?
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The problem of air pollution is becoming more serious ______
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Now the air pollution in this city ( ) more and more serious
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Th problem which the air pollution in cities has become more
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_____ serious the water pollution is in our city today!A)Wha
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为什么在The ____problem of our city is air pollution.中不能用worst?
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Pollution problem is very serious. Can we _____? [
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Pollution is a serious problem. Scientists have _______ some