Which of the following is true according to the passage?A. Dogsledding is the most popular sport among local people.B. Watching wildlife is a memorable experience.C. Travellers should bring their own sports equipment.D. Shopping is too simple a pleasure to enjoy.
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Which of the following problems may be encountered by using an oil having a viscosity higher than that specified for an operating hydraulic system?A.External seal leakageB.Hunting due to fast responseC.Hydraulic oil film breakdownD.Increased power consumption
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.Researchers have found that the risk of cancer in the mouth and neck is higher with people_________.A:who drink alcohol outside of mealsB:who drink alcohol at mealsC:who never drink alcoholD:who drink alcohol at bars and pubs
Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised. First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent . Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth. What is implied but not stated by the author is that ________.a.smoking rates among youth have declined very little b.there are now more female than male smokers among high school seniors c.high smoking rates are due to the incease in wealth d.smoking at high school are from low socio-economic backgrounds
A recent US study found that people who score high for extroversion rate themselves as leaner and taller than they acmally are,with male extroverts weighing more than introverts.Conscientiousness is associated with a healthier weight,xvith the most conscientious（in the top 25%）weighing on average almost Skg less than the least conscientious（in the bottom 25%）.Participants scoring low on emotional stability tended to overestimate their weight,although women who gave themselves a low score did actually weigh more than others with higher scores on this trait.These findings held across all of the ethnic groups included in the study.While some links are unsurprising（eg.conscientious people stick to their diets）,some are not so easy to explain.Why,for example,do extrovcrted men weigh more?Is it because they're always in the pub?If so,perhaps the"beer goggle"effect explains why they rate themselves as taller and thinner than they actually are.
Contrary （ ） the popular opinion, higher taxes end up benefiting the citizens more than lower ones.A.for B.in C.to D.with
共用题干 第一篇Carbon FootprintHow often do you travel by plane?How much electricity do you use?These days everyone is worried about the size of their carbon footprint.In order to reduce global warming we need to make our carbon footprints smaller. But how much CO2 are we responsible for?A new book might be able to help.The Carbon Footprint of Everything looks at the different things we do and buy,and calculates the amount of CO2 all of the following created:the ingredients, the electricity used in the brewery，the equipment,the travel and commuting of the beer,and the packaging. It's amazing how many different things need to be included in each calculation.And it's frightening how much carbon dioxide everything produces.But all of this can help us decide which beer to drink.From Berners-Lee's calculations,it's clear that a pint(568ml)of locally-brewed beer has a smaller carbon footprint than a bottle of imported beer. This is because the imported beer has been transported from far away,and it uses more packaging. The local beer only produces 300g of CO2,but the imported beer produces 900g! So, one pint of local beer is better for the environment than three cans of cheap foreign lager from the supermarket.Berners-Lee has even calculated the carbon footprint of cycling to work.Nothing is more environmentally-friendly than riding a bike,surely?Well,it depends on what you've had to eat before. To ride a bike we need energy and for energy we need food.So if we eat a banana and then ride a kilometer and a half,our footprint is 65g of CO2.However,if we eat bacon before the bike ride,it's 200g. In fact,bananas are good in general because they don't need packaging,they can be transported by boat and they grow in natural sunlight.So,does this mean that cycling is bad for the environment?Absolutely not,for a start,if you cycle,you don't use your car,and the fewer cars on the road,the fewer traffic jams.And cars in traffic jams produce three times more CO2 than cars traveling at speed.Cycling also makes you healthy and less likely to go to a hospital. And hospitals have very big carbon footprints!So maybe it's time for us all to start making some changes.Pass me a banana and a pint of local beer,please.According to Berners-Lee,which of the following produces the most carbon dioxide?A:A pint of local beer we drink.B:A pint of imported beer we drink.C:A banana we eat before a bike ride.D:The bacon we eat before a bike ride.
