[单选题]Children may get into some bad habits __________ they lack self-discipline.
A.when
B.unless
C.though
D.until

[单选题]Children may get into some bad habits ___________ they lack self-discipline.
A.when
B.unless
C.though
D.until

[不定项选择题]共用题干 第一篇

In what may be bad news for bars and pubs,a European research group has found that people drinking alcohol outside of meals have a significantly higher risk of cancer in the mouth and neck than do those taking their libations with food.Luigino Dal Maso and his colleagues studied the drinking pattems of 1 ,500 patients from four cancer studies and another 3,500 adults who had never had cancer.
After the researchers accounted for the amount of alcohol consumed,they found that individuals who downed a significant share of their alcohol outside of meals faced at least a 50 to 80 percent risk of cancer in the oral cavity（腔）,pharynx（咽）,and esophagus（食管）,when compared with people who drank only at meals.Consuming alcohol without food also increased by at least 20 percent the likelihood of laryngeal（喉）cancer."Roughly 95 percent of cancers at these four sites traced to smoking or drinking by the study volunteers,"Dal Maso says.The discouraging news,his team reports, is that drinking with meals didn't eliminate cancer risk at any of the sites.
For their new analysis,the European scientists divided people in the study into four groups, based on how many drinks they reported having in an average week.The lowest-intake group includ-ed people who averaged up to 20 drinks a week.The highest group reported downing at least 56 servings of alcohol weekly for an average of eight or more per day.Cancer risks for the mouth and neck sites rose steadily with consumption even for people who reported drinking only with meals.For instance,compared with people in the lowest-consumption group,participants who drank 21 to 34 alcohol servings a week at least doubled their cancer risk for all sites other than the laryngeal cancer. If people in these consumption groups took some of those drinks outside meals,those in the higher consumption group at least quadrupled their risk for oral cavity and esophageal cancers.
People in the highest-consumption group who drank only with meals had 10 times the risk of oral cancer,7 times the risk of pharyngeal cancer,and 16 times the risk of esophageal cancer compared with those who averaged 20 or fewer drinks a week with meals.In contrast,laryngeal cancer risk in the high-intake,with-meals-only group was only triple that in the low-intake consumers who drank with meals.
"Alcohol can inflame tissues.Over time,that inflammation can trigger cancer."Dal Maso says.He suspects that food reduced cancer risk either by partially coating digestive-tract tissues or by scrubbing alcohol off those tissues.He speculates that the reason laryngeal risks were dramatically lower for all study participants traces to the tissue's lower exposure to alcohol. According to the last paragraph,tissue's lower exposure to alcohol__________.
A.explains why inflammation triggers cancer
B.accounts for why food can coat digestive-tract tissues
C.is the reason why food can scrub alcohol off tissues
D.reduces the risk of laryngeal cancer

[单选题]What enables some people to get big creative breakthroughs while others only get small and?non-creative breakdowns,blaming themselves and society?Are some people“gifted”?Are there?other factors?21?work—factors that we have more control over than we think? While nobody can deny the?22?that some people seem to be blessed with particular?creativity,research shows that anyone can?23?their chances of coming up with new and original?ideas?24?they would only engage themselves more in the process of?25．It′s the old Thomas?Edison thing about“discovery?26?99 percent perspiration(汗水)and 1 percent inspiration．”27,the studies prove this:great creative breakthroughs usually happen only?28?intense?periods of struggle．It is sustained effort towards a specific goal?29?eventually prepares for great?creative insights． This kind of sustained effort does not always?30?immediate results,a fact that not only?separates the innovators(革新者)from non-innovators,but?31?leads some people to conclude?that it is just not?32?for them．“Maybe I should have gone to medical school like my mother?wanted,”they wonder when the breakthrough is?33?to be found．Alas,one forgets during their?inevitable encounters?34?self-doubt,that the big surprise is never?35．Indeed,it can happen?at any time and place． 第33题的答案是（ ）
A.anywhere
B.everywhere
C.somewhere
D.nowhere