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  3. Over the years, pregnant women have asked Donald Redelmeier, at Toronto’s Sunnybrook Hospital, about the dangers of diving, hot

Over the years, pregnant women have asked Donald Redelmeier, at Toronto’s Sunnybrook Hospital, about the dangers of diving, hot

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问题     Over the years, pregnant women have asked Donald Redelmeier, at Toronto’s Sunnybrook Hospital, about the dangers of diving, hot tubs, flying, mountaineering, cycling, bear attacks and all sorts of other exotic risks,【C1】________they never【C2】________road accidents. His new study, published in the Canadian Medical Association Journal,【C3】________they should.
    Dr. Redelmeier and his colleagues wanted to know【C4】________pregnancy makes a woman driver more likely to be【C5】________in a car crash. So they【C6】________data from the Ontario Health Insurance Plan, which records health visits for the Canadian province’s 13m residents. The researchers【C7】________women who, in the months before giving birth,【C8】________a hospital emergency unit after a car accident in which they had been driving. They【C9】________looked at those women’s hospital visits in the three years before becoming pregnant and for one year【C10】________the birth.
    They found that being pregnant made the women 42％ more likely to be in a serious car crash. The【C11】________peaked in the fourth month of pregnancy. It seems that being pregnant is about as【C12】________for drivers as having sleep apnoea, which【C13】________people to snore and choke themselves awake throughout the night, leaving them【C14】________during the day.
    Women’s driving seemed to be affected【C15】________how rich or poor or old they were, whether their pregnancy was【C16】________or straightforward, or whether they already had children. To 【C17】________the possibility that pregnant women simply had an increased【C18】________to seek care— or,【C19】________layman’s terms, were neurotic—they looked at whether they were more likely to go to hospital when involved in crashes that they did not cause,【C20】________they were passengers or pedestrians. The answer was "no".
【C20】
选项 A、although
B、once
C、unless
D、because
答案D
解析 because。本题考查连词辨析。四个选项分别为A项although“尽管”；B项once“一旦”；C项unless“除非”；D项because“因为”。该空上下文没有出现相反信息或者矛盾观点，而只是简单解释。文中crashes that they did not cause表明不是她们导致的车祸，后面“________they were passengers or pedestrians”显然是原因说明，选项中能表示原因的只有because，即因为她们是乘客或者行人。故本题答案为D项。
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