2014高考英语二轮说明文型完形填空专题限时训练专题限时训练.doc

专题限时训练(二十六)说明文型完形填空 (限时：30分钟) (一)The findings come from a study of nearly 1,000 US people that looked at diet, calorie intake and body mass index (BMI) a measure of obesity._1_ is found that those who ate chocolate a few times a week were, on _2_， slimmer than those _3_ ate it occasionally. Even _4_ chocolate is loaded with calories, it contains ingredients(成分)that may favour weight loss _5_ than fat synthesis, scientists believe._6_ boosting calorie intake, regular chocolate consumption was related to lower BMI in the study, _7_ is published in Archives of Internal Medicine. The link remained even when other factors, like how _8_ exercise individuals did, were taken into _9_.And it appears it is how often you eat chocolate that is important, rather than how much of it you eat. The _10_ found no link with quantity consumed._11_ to the researchers, there is only one chance in a hundred that their findings could be explained by chance alone. Lead author Dr Beatrice Golomb, from the University of California at San Diego, said: “Our findings appear to add to a body of information suggesting that the composition of calories, not just the number of them, matters for determining their ultimate impact on weight.”This is not the first time scientists _12_ that chocolate may be healthy for us. Other studies have claimed chocolate may be good for the heart. Consumption of certain types of chocolate has been linked to some favourable changes in blood pressure, insulin(胰岛素)sensitivity and cholesterol(胆固醇)level. And chocolate, _13_ dark chocolate, does contain antioxidants(抗氧化剂)which can help to mop up harmful free radicalsunstable chemicals that can damage our cells.Dr Golomb and her team believe that antioxidant compounds, called catechins(儿茶素), can improve lean muscle mass and reduce weight _14_ studies in rodents would suggest this might be so. Mice _15_ for 15 days with epicatechin (present in dark chocolate) had improved exercise performance and observable changes to their muscle composition.They say clinical trials are now needed in humans to see _16_ this is the case.But before you reach _17_ a chocolate bar, there are still lots of unanswered questions. And in the absence of conclusive evidence, experts advise caution.While theres no harm in allowing yourself a treat like _18_ now and again, eating too much might be harmful because it often _19_ a lot of sugar and fat too.And if you are looking to change your diet, you are _20_ to benefit most from eating more fresh fruits and vegetables.1A.As BItCWhich DWhat2A.whole BaverageCgeneral Dshort3A.who Bthat Cwhich Dwhy4A.though BsoCbut Dor5A.other BratherCless Dmore6A.Though BEven if CWhen DDespite7A.that BwhichCwhere Dwhen8A.much BoftenClong Dmany9A.thought Bmind Caccount Deffect10A.news BreportCstudy Dbook11A.According BBasedCReply DResponse12A.had suggested BsuggestedChave suggested Dsuggest13A.specially BparticularlyCluckily Dunfortunately14A.at least Bat mostCin fact Dby accident15A.feeding BfedCto feed Dfeed16A.if Bwhat Cwhy Dthat17A.out BforCwith Dinto18A.noodles BchocolateCrice Dnuts19A.includes BtakesCabsorbs Dcontains20A.probable BpossibleClikely Dabout(二)A survey done by the University of Michigan shows a big drop in the number of teenagers who say they smoke cigarettes. In the _1_ ，over 44,000 students in grades 8,10 and 12，from 424 schools across the _2_ were asked about their smoking _3_ . The results show that smoking among 8th graders _4_ from 21 percent in 2002，to 12 percent in 2007. In the same _5_ ，smoking dropped from 30% to 21% among 10th graders and from 37 % to 30 % among 12th graders. Antismoking organizations think educating kids about smoking risks is the _6_ of the drop. “These important _7_ in teen smoking did not just happen by chance，” says study director Lloyd DJohnston. “A lot of _8_ and organizations have been trying to _9_ the high rates of teenagers.” Others say the _10_ price of cigarettes is an important reason teens are cutting back. _11_ the reason，the drop in teen smoking is good news to everyone，even cigarettemaking companies who _12_ their product is only for adults，not kids. Health experts are _13_ paying attention to teenage smoking habits _14_ lifetime smokers often get hooked on smoking at an early age. But some say that the new figures arent exactly the cause for _15_ . While it is true _16_ teens are smoking today than five years ago，the _17_ of teen smoking is still higher than it was. Cigarette smoking is the _18_ cause of preventable death and disease in this country. “Our survey _19_ that a lot of teens still do not understand the _20_ of smoking，particularly the younger teens，” Johnston said.1A.study BsurveyCtalk Dchart2A.country Bschool Ccity Duniversity3A.habits BnumberClife Dquality4A.went up Bcame upCwent down Dcame over5A.period BgradeCgroup Dyear6A.result BcauseCplan Dexcuse7A.figures BresultsChabits Ddrops8A.schools BteachersCindividuals Dstudents9A.bring down Bbring upCtake off Dget down10A.higher BreasonableClower Dnormal11A.Whichever BWhateverCHowever DWherever12A.ask Bdoubt Cwarn