问题
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According to the speaker, what is the feature of air pollutants?A.Its contents often remai
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According to the passage, air turbulence generally does which of the following? Ⅰ. Creates
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The title of the passage could be______.A.Introduction to Flying BlueB.Flying with Air Fra
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According to the advertisement, Heaven Air believes it is ______ .A.the second biggest in
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According to this passage, "Mach" refers toA.the ratio of the air speed of an aircraft to
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The main purpose of the passage is to______.A.introduce the dangers of air-conditioningB.e