题目
题型：同步题难度：来源：
Scientists have discovered that the fruit is a great source of sugar that can be readily distilled (蒸馏) into
alcohol to power cars and farm machinery.
And because sellers reject 360,000 tons of" substandard"fruit annually in America alone they could be used
as an economical way to make fuel.
The waste from US growers could produce nearly two million gallons( nine million litres) of biofuel per
year.
In the study, researchers at the United States Department of Agriculture set out to determine the biofuel
potential of juice from rejected watermelons-those not sold due to cosmetic imperfec tions, and currently
ploughed back into the field.
About a fifth of each annual watermelon crop is left in the field because of surface blemishes (瑕疵) or
because they are missha pen.
Dr Wayne Fish, who led the team, found that 50 per cent of the fruit was fermentable(可发酵的) into
alcohol which could provide valuable fuel.
"We"ve shown that the juice of these melons is a source of readily fermentable sugars, representing an
unexploited raw material for alcohol biofuel production," he said.
The study, published in the journal Biotechnology for biofuels, discovered that watermelons could produce
around 20 gallons of fuel per acre from fruit that otherwise would go to waste.
Production of biofuels has been targeted by western govern ments as a way to support renewable energy
targets.
The European Union has a target for 2010 that 5.75 per cent of transport fuels should come from biological
sources, but the target is unlikely to be met.
The British government"s Renewable Transport Fuel Obligation requires five per cent of the fuel sold at the
pump by 2010 to be biofuel.
B. watermelons could be used to make fuel
C. the advantages of fuel made from watermelons
D. watermelon juice will be the largest source of renewable en ergy
B. They are imperfect.
C. They are misshapen.
D. They are oversupplied.
B. about two gallons of fuel could be made from rejected fruit per acre
C. half of the watermelons were fermentable into alcohol to provide energy
D. five per cent of fuel is required to be biofuel from watermel ons by 2010 in Britain
B. flavor
C. surface
D. freshness
答案
核心考点
试题【阅读理解。 Forget chip fat, sugar cane or rapeseed oil-the latest source of biofu】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
rounds as a doctor.
But today"s British teenagers, a survey suggests, seem to have set their sights only on becoming the next
Leona Lewis or Wayne Rooney.
Researchers questioned 3,000 teenagers about their ambitions and also asked parents about their youthful
career hopes.
According to the survey, youngsters dream of a celebrity (明星) lifestyle, perhaps after finding fame
through shows such as the X Factor, and of being actors or sports stars.
Copying the likes of Rooney and David Beckham was the top career ambition of today"s teenagers,cited by
12 percent.
Almost as many,11 percent, wanted to be pop stars, and the same proportion dreamed of being actors.
The success of celebrity chefs such as James Oliver and Cor don Ramsay is likely to explain why becoming a chef is now the dream of 5 percent, a career ambition which did not figure in the list of 25 years ago.
A quarter of a century back teaching was the top career choice, cited by 15 percent. These days the job is
chosen by only 4 percent.
Of the traditional professions, only law has risen in popularity. The survey also suggests that more girls
dream of becoming doctors and boys want careers as astronauts or firefighters.
Child psychologist Laverne Antrobus said the findings reflect today"s celebrity culture and warned children
against unrealistic dreams.
"Children see footballs, pop stars and actors on TV and their lives look exciting, glamorous and fun," she
said."It is hard for them to realize that, they are the end product of a lot of ingredients including talent,
determination and years of hard work. Wayne Rooney is not on the pitch by chance."
As Antrobus pointed out, there is absolutely nothing wrong with children having big dreams, but" these have
to be based on reality," she said.
B. work as hard as
C. enjoy the celebrity lifestyles of
D. become successful by chance like
B. 22 percent of British teenagers surveyed wanted to be pop stars or actors.
C. None of the traditional professions are favored by today"s British teenagers.
D. Teaching, though less popular, seems to remain one of the top career choices on the list.
B. mirrors today"s celebrity culture
C. shows how realistic youngsters are
D. suggests British teenagers watch too much TV
B. Wayne Rooney didn"t get into sport by chance.
C. Wayne Rooney doesn"t believe in luck when he is playing.
D. Wayne Rooney didn"t become successful by luck.
phone do things you have no control over, computer security (安全) experts 2 . It might 3 the White
House or the police, or forward your personal address book to a marketing company. Or it could simply eat
into the phone"s operating software, turning it 4 and erasing your personal information. Similar viruses have
already made mobile phone owners 5 . in Japan and Europe.
Ari Hypponen, chief technical officer of a computer security in Finland, said a virus can get your 6 and
send them elsewhere. And it can record your 7 . Mobiles are now able to surf the Net, send emails and 8
software, so they are an easy 9 for the same hackers who have sent viruses to computers over the last
decade. "It"s technically 10 now," said Stephen Trilling, director of research at anti-virus 11 maker
Symantec Corp based in the US."If the phone is connected to the 12 , it can be used to transmit threats and
13 targets, just as any computer can."
In Japan, if you opened a certain email message 14 your mobile, It would cause the phone to repeatedly
15 the national emergency number. So phone operators had to 16 emergency calls until the bug was
17 .
In Europe, mobile"s short message service, 18 SMS, has been used to send codes that could damage
phones.
Mobile users can 19 viruses, of course, by sticking to their traditional phones 20 Web links, some
experts said.
| ( )l. A. get ( )2. A. speak ( )3. A. lead ( )4. A. off ( )5. A. interested ( )6. A. messages ( )7. A. voice ( )8. A. make ( )9. A. job ( )10. A. impossible ( )11. A. hardware ( )12. A. computer ( )13. A. strike ( )14. A. in ( )15. A. send ( )16. A. cancel ( )17. A. removed ( )18. A. and ( )19. A. stop ( )20. A. beyond | B. force B. talk B. cause B. out B. angry B. passage B. passwords B. destroy B. task B. possible B. software B. television B. visit B. by B. dial B. ban B. cleaned B. nor B. avoid B. with | C. make C. tell C. control C. down C. excited C. news C. music C. download C. mission C. useful C. computer C. Internet C. inquire C. on C. count C. stop C. called C. or C. kill C. over | D. damage D. say D. call D. on D. terrified D. information D. address D. develop D. target D. valuable D. equipment D. radio D. attack D. with D. press D. prevent D. cleared D. but D. find D. without | ||
| 阅读理解。 | |||||
| Honesty comes in many forms. First there"s self-honesty. Is what people see the real article or do you appear through smoke and mirrors? I find that if I try to be something I"m not. I feel unsure of myself and take out a part from my PBA (personal bank account). I love how singer Judy Garland put it. "Always be a first-class version(版本) of yourself, instead of a second-class version of somebody else." Then there"s honesty in our actions. Are you honest at school, with your parents, and with your boss? If you"ve ever been dishonest, I think we all have, try being honest, and notice how whole it makes you feel. Remember, you can"t do wrong and feel right. This story by Jeff is a good example of that: In my second year of study, there were three kids in my math class who didn"t do well. I was really good at it. I would charge them three dollars for each test that I helped them pass. I"d write on a little piece of paper all the right answers, and hand them off. At first I felt like I was making money, kind of a nice job. I wasn"t thinking about how it could hurt all of us. After a while I realized I shouldn"t do that anymore, because I wasn"t really helping them. They weren"t learning anything, and it would only get harder down the road. Cheating certainly wasn"t helping me. It takes courage to be honest when people all around you are getting away with cheating on tests, lying to their parents, and stealing at work. But, remember, every act of honesty is a deposit (储蓄) into your PBA and will build strength. | |||||
| 1. The underlined part "appear through smoke and mirrors" in the first paragraph means "_____". | |||||
| A. to be honest B. to be unreal C. to become clear D. to come from an imagined world | |||||
| 2. Which of the following can best explain Judy Garland"s words? | |||||
| A. Be your true self rather than follow others. B. Don"t copy others or you can"t be the first class. C. Make efforts to be the first instead of the second. D. Don"t learn from others unless they"re excellent. | |||||
| 3. What does the author expect to show by Jeff"s story? | |||||
| A. Honesty can be of great help. B. A bad thing can be turned into a good one. C. Helping others cheat can do good to nobody. D. Be honest in our actions and feel right. | |||||
| 4. In the last paragraph the author mainly wants to express _____. | |||||
| A. one must be brave to be honest B. it"s difficult to be honest when others are not C. one should be honest when making a deposit D. honesty in one"s actions can help him in the future | |||||
| 阅读理解。 | |||||
| As bananas ripen, the green skin turns yellow gradually. Chemical changes occur in the flesh of the fruit as well: starch (淀粉) changes to sugar; pectin (果胶) breaks down, losing its stiffness; and the flesh softens. Is ripening fruit a self-contained system, or is the rate of these changes affected by the environment? We designed the experiment below to see if different atmospheres, produced by different packaging, affected the rate of ripening. You will vary the atmosphere surrounding unripe bananas and observe the effect on the ripening process.
|
