those是那些的含义如果是these应该考虑
但横线上的应该是指污染,前文有提到,而且是复数所以要选B
air coditions do cause us some environment problems —in fact
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Cars do cause us some health problems--in fact far more seri
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代词方面Cars do cause us some health problems---in fact far more
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cause in law 和 cause in fact 的区别
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The environment is exactly everything that affect us in some
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problems,depending on their nature,cause in us sadness拜托了各位