1.B ones 替代前面的problems
2.C
Lack of confidence does cause some problems--in fact far mor
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1.Cars do cause people some health problems,in fact far more
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Cars do cause us some health problems--in fact far more seri
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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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air coditions do cause us some environment problems —in fact
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Cars do cause us some health problem —in fact more serious o
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Cars do us some health problems---in fact far more serious__
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The real trouble ——their lack of confidence in their abiliti
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describe some of the problems caused by overcrowding
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the a___ of confidence is the cause of his failure in the ex