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  3. Around one in a hundred deaths worldwide is due to passive smoking, which kills an estimated 600,000 people a year, World Health

Around one in a hundred deaths worldwide is due to passive smoking, which kills an estimated 600,000 people a year, World Health

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问题     Around one in a hundred deaths worldwide is due to passive smoking, which kills an estimated 600,000 people a year, World Health Organization(WHO)researchers said recently.
    In the first study to(1)______ the global impact of second-hand smoke, WHO experts found that children are more(2)______ exposed to second-hand smoke than any other age-group, and around 165, 000 of them a year die of it.
    " Two-thirds of these deaths (3)______ in Africa and South Asia," the researchers wrote in their study.(4)______ exposure to second-hand smoke, the double blow of (5)______ diseases and tobacco seems to be a deadly(6)______ for children in these regions.
    Commenting(7)______ the findings, researchers said policymakers try to(8)______families to stop smoking in the home. In some countries, smoke-free homes are becoming the norm, but(9)______universally.
    To get(10)______data from all 192, WHO researchers had to go back to 2004. Worldwide,40 percent of children were exposed to second-hand smoke in 2004. This exposure was (11)______to have caused 379,000 deaths from heart disease, 165,000 from lower(12)______ infections, and 21,400 from lung cancer. For the full impact of smoking, these deaths should be(13)______to the estimated 5. 1 million deaths a year(14)______to active tobacco use, the researchers said.
     (15)______ deaths due to passive smoking in children were (16)______ toward poor and middle-income countries, deaths in adults were spread across countries (17)______all income levels.
    In Europe’s high-income countries , only 71 child deaths occurred, while 35,388 deaths were in adults. (18)______ in the countries assessed in Africa, an estimated 43,375 deaths(19)______ passive smoking were in children(20)______9,514 in adults.
(15)
选项 A、While
B、As
C、Since
D、When
答案A
解析 连词辨析题。此句中包含转折关系，因此选择[A]while，意为“虽然，尽管”。[B]As放在句首引导从句，意为“因为，当……的时候”，[C]Since意为“既然”，[D]When意为“当……的时候”，此三个选项用在此处均不能表示转折关系，排除。
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