A．comprehensiveB．spreadC．impactD．incredibleE．observedF．comparedG．successH．firmlyI．combinationJ．heavilyK．motivateAnewreportbytheWorldHealthOrganization（WHO）revealsthataroundoneinahundreddeat

　　A．comprehensive B．spread C．impact D．incredible E．observed

　　F．compared G．success H．firmly I．combination J．heavily K．motivateA new report by the World Health Organization （WHO） reveals that around one in a hundred deaths worldwide is due to passive smoking，which kills an estimated 600，000people a year．

　　In the first study to assess the global （41）___ of second-hand smoke，WHO experts find that children are more （42）___ exposed to second-hand smoke than any other age-group，and around 165，000of them a year die because of it．

　　Children's exposure to second-hand smoke is most likely to happen at home，and the double blow of infectious diseases and tobacco seems to be a deadly （43）___ for children in these regions．Commenting on the findings，Heather Wipfli and Jonathan Samet from the University of Southern California，said policymakers try to （44）___ families to stop smoking in the home．

　　While deaths due to passive smoking in children were skewed（曲解） toward poor and middle-income countries，deaths in adults were （45）___ across countries at all income levels．

　　In Europe's high-income countries，only 71child deaths occurred，while 35，388deaths were in adults．Yet in the countries like Africa，an estimated 43，375deaths due to passive smoking were in children （46）___ with 9，514in adults．

　　Only 7.4percent of the world population currently lives in places with （47）___ smoke-free laws，and those laws are not always（48）___ enforced（施行）．In places where smoke-free rules are （49）___，research shows that exposure to second-hand smoke in high-risk places like bars and restaurants can be cut by 90percent，and in general by 60percent，the researchers said．

　　Studies also show such laws help to reduce the number of cigarettes smoked by smokers and lead to higher （50）___ rates in those trying to quit．