限时阅读训练11

1、高二英语限时阅读训练（一）With petroleum reserve （石油储量）decreasing, the search is on to replace gas with a cleaner, gree ner alter native . Though much eco-talk has cen tered on biofuels from corn and soybea ns, the biofuel that looks more likely lo replace petroleum comes from a most un likely source: algae .Alg

2、ae （藻类），like corn, soybeans, and other crops, grow through photosynthesis （光合作 用） and can be processed into fuel oil. However, they yield 30 times more energy than land crops such as soybeans, according to the U. S. Department of Energy . Many algae species also can grow in saltwater and polluted wa

3、ter while corn and soy require, arable land and fresh water that will be in short supply as the worlds population balloons .If you replaced all the diesel （柴油）in the U . S. with soy biodiesel, it would take half the land mass of the U.S. to grow those soybeans, says Matt Caspari, chief executive of

4、Aurora Biofuels, a Berkeley, Calif-based private firm that specializes in algae oil tech no logy . On the other hand, the Energy Department says that if algae fuel replaced all the petroleum fuel in the United States, it would require 15,000 square miles, which is a few thousand miles larger that Ma

5、ryland（12,407squaree miles） , the 42nd state in land area.Ano ther bonus: Because algae can be grow n just about any where in a closed space, theyre being tested at several power pla nts across the n ati on as a carb on absorber Smokestack emissi ons （烟囱排放物）can be pumped directly into the ponds, fee

6、ding the algae while keepinggree nhouse gases out of the atmosphereAlthough process ing tech no logy for algae fuel also known as oilgae in some environmentalist circles is improving, its still years away from reaching your local gas pump . its just a question of cost, because no large-scale facilit

7、ies have been built yet, Casparisays .56 .The un derl ined word yield in Paragraph 2 can be replaced by II57 .58 .A . controlB . give ingrowD . produceCompared with corn and soybea ns, algaeA . may pollute water and soilC . can grow in poor con diti onsprovide much less en ergyn eed more special car

8、eAccord ing to Paragraph 3, one of the adva ntages of produc ing algae fuel is thatA . it can be used more widelyit is more easy to produceC . it n eeds much less landit costs much less money59 .A . People can grow algae any where .Algae help protect the en vir onment.C . Fish can get more oxyge n f

9、rom algae.Algae product less waste .Birds that are half-asleepwith onebrainhemisphere （半球）alert and the otherWhat do we lear n about algae from Paragraph 4?sleep ingcon trol which side of the brain remai ns awake, accord ing to a new study of sleep ing ducks.s eye stays(Earlier studies have docume n

10、ted half-bra in sleep in a wide range of birds. The brain hemispheres take turns si nking into the sleep stage characterized by slow brain waves. The eye con trolled by the sleep ing hemisphere keeps shut, while the wakeful hemisphere and alert. Birds also can sleep with both hemispheres resti ng at

11、 once.Decades of studies of bird groups led researchers to predict extra alertness in the en d-of-the-row sleepers which tend to be attacked more easily. Sure eno ugh, the end birds ten ded to watch carefully on the side away from their compa nions. Ducks in the inner spots showed no prefere nee for

12、 gaze directi on.Also, birds n app ing at the end of the line depe nd on sin gle-hemisphere sleep, rather tha n total relaxati on, more often tha n inner ducks did. Turning 16 birds through the positi ons in a four-duck row, the researchers found that compared with 12 perce nt for birds in internal

13、spots, outer birds half-asleep duri ng some 32 perce nt of n app ing time.“ Webelieve this is the first evidenee for an animal behaviorally controlling sleep and wakefu In ess at the same time in differe nt regi ons of the brai n,” the researchers say.The results provide the best evide nee for a Ion

14、 g-sta nding assumpti on that sin gle-hemispheresleep evolved as creatures sca nned for en emies. The prefere nee for ope ning an eye on the lookout zoo and in a sin gle pet bird sleep ing by a mirror. The mirror-side eye closed as if the reflect ion were a compa nion and the other eye stayed ope n.

15、side could be widespread, he predicts. Hes seen it in a pair of birds nappsgesinieheUseful as half- sleeping might be, it only been found in birds and such water animals as dolph ins, whales, and seals. Perhaps keep ing one side of the brain awake allows a sleep ing ani mal to surface occasi on ally

16、 to avoid drow ning.Studies of birds may offer unique in sights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds half-brain sleep “ isjust the tip of the iceberg . ” He supposes that more examples may turn up whe n we take a closer look at other species.60. According to the passage,

17、 birds often half sleep because.A. their brain hemispheres take tur ns to restB. they have to watch out for possible attacksC. the two halves of their brain are differe ntly structuredD. they have to con sta ntly keep an eye on their compa nions61. What is implied about the example of a bird s sleep

18、ing in front of a mirror?A. An imag ined compa nion gives the bird a sense of security.B. Birds prefer to sleep in pairs for the sake of their security.C. The phe nomenon of birds n app ing in pairs is widespread.D. A sin gle pet bird enjoys see ing its own reflect ion in the mirror.62. While sleep

19、ing, some water an imals tend to keep half awake in order to.A. alert themselves to the approach ing en emyB. emerge from water now and the n to breatheC. be sen sitive to the ever-cha nging environmentD. avoid being swept away by rapid curre nts63. By saying just fhe tip of the iceberg ” , Siegel s

20、uggests that.A. half-brain sleep has someth ing to do with icy weatherB. the mystery of half-brain sleep is close to being solvedC. most birds livi ng in cold regi ons tend to be half sleepersD. half-brain sleep may exist among other speciesCWash ington, November 1,2012 (CNN) - After years of pla nn

21、ing and mon ths of campaig ning, the most expensive presidential race in history comes down to a final five-day whirlwind( 旋风)of speeches and televisi on ads in the eight states still up for grabs.Preside nt Barack Obama and Republica n challe nger Mitt Romney pla n to hold virtually non stop events

22、 betwee n now and the Tuesday electi on con sidered too close to call.The focus is on battlegro und states worth 95 of the 270 electoral votes n eeded to win. Both sides are trying to close the deal with a decreasing number of uncommitted voters, while making sure supporters actually cast ballots.Th

23、at means a game of campaig n chess that started Thursday, with appeara nces by the can didates and their assista nts as well as advertis ing dollars allocated to the places con sidered most vital to success.Con cludi ng a race expected to cost more tha n $6 billi on overall, Obama and Romney and the

24、ir running mates will hit all the battleground states - Colorado, Florida, Iowa, Ohio, New Hampshire, Nevada, Virginia and Wisconsin. The campaigns also are unioading a blast of televisi on ads and maili ngs that threate n to overwhelm voters already saturated with politick ing. Perhaps no one said

25、it better tha n 4-year-old Abigael Evans of Fort Colli ns, Colorado, who -accord ing to NPR - cried after liste ning to more elect ion coverage on the radio and told her mother: Im tired of Broncobama and Mitt Romney.64. The underlined phrase too close to call probably means .A . a game that one sid

26、e is obviously winning.B. a tie in which neither side seems likely to winC. so close that you need not use a telephoneD. a visit close to one home state65. What is the focus of the last -5 -day campaig ns for both preside ntial can didates?A . To make sure that their supporters understand their poli

27、cies.B. To collect eno ugh money for campaig n ads.C. To paint their rival as black as possible.D. To win over the voters who have not decide which can didate to vote for.66. The public gen erally feel about these last-days elect ion efforts.A . excitedB . disappo in ted C. anno yed D. relievedDLone

28、liness has been linked to depression （抑郁）and other health problems. Now, a study says it can also spread. A friend of a Ionely person was fifty-two percent more likely to develop feelings of Ioneliness. And a friend of that friend was twenty-five percent more likely to do the same.Earlier findings s

29、howed that happ in ess, obesity（ 肥胖）and the ability to stop smok in g can also spread like in fecti ons with in social groups. The findings all come from a major health study in the America n tow n of Fram in gham, Massachusetts.The study bega n in 1948 to in vestigate the causes of heart disease. S

30、ince the n, more tests have bee n added, in cludi ng measures of Ion eli ness and depressi on.The new findings involved more than five thousand people in the second generation of the Fram in gham Heart Study. The researchers exam ined frien dship histories and reports of Ion eli ness. The results es

31、tablished a patter n that spread as people reported fewer close frien ds.For example, l on eli ness can affect relati on ships betwee n n ext-door n eighbors. The Ion eli ness spreads as n eighbors who were close friends now spe nd less time together. The study also found that Ioneliness spreads mor

32、e easily among women than men.The average pers on is said to experie nee feeli ngs of Ion eli ness about forty-eight days a year.The study found that havi ng a Ion ely friend can add about seve ntee n days. But every additi onal friend can decrease Ion eli ness by two and a half days.Lon ely people become less and less trusti ng of others. This makes it more and more difficult for them to make friends and more likely t