2.Number sense is not the ability to count.It is the ability to recognize a(16)C in number.Human beings are born with this ability.(17)B,experiments show that many animals are,too.For example,many birds have good number sense.If a nest has four eggs and you remove one,the bird will not(18)D.However,if you remove two,the bird(19)Aleaves.This means that the bird knows the (20)Cbetween two and three.
Another interesting experiment showed a bird's(21)Anumber sense.A man was trying to take a photo of a crow(乌鸦)that had a nest in a tower,but the crow always left when she saw him coming.The bird did not(22)Duntil the man left the tower.The man had an(23)C.He took another man with him to the tower.One man left and the other stayed,but they did not(24)B the bird.The crow stayed away until the second man left,too.The experiment was(25)Dwith three men and then with four men.But the crow did not return to the nest until all the men were(26)B.It was not until five men went into the tower and only four left that they were(27)D able to fool the crow.
How good is a human's number sense?It's not very good.For example,babies about fourteen months old almost always notice if something is taken away from a (28)B group.But when the number goes beyond three or four,the children are(29)Dfooled.
It seems that number sense is something we have in common with many animals in this world,and that our human (30)C is not much better than a crow's.
Another interesting experiment showed a bird's(21)Anumber sense.A man was trying to take a photo of a crow(乌鸦)that had a nest in a tower,but the crow always left when she saw him coming.The bird did not(22)Duntil the man left the tower.The man had an(23)C.He took another man with him to the tower.One man left and the other stayed,but they did not(24)B the bird.The crow stayed away until the second man left,too.The experiment was(25)Dwith three men and then with four men.But the crow did not return to the nest until all the men were(26)B.It was not until five men went into the tower and only four left that they were(27)D able to fool the crow.
How good is a human's number sense?It's not very good.For example,babies about fourteen months old almost always notice if something is taken away from a (28)B group.But when the number goes beyond three or four,the children are(29)Dfooled.
It seems that number sense is something we have in common with many animals in this world,and that our human (30)C is not much better than a crow's.
| 16.A.rise | B.pattern | C.change | D.trend |
| 17.A.Importantly | B.Surprisingly | C.Disappointedly | D.Fortunately |
| 18.A.survive | B.care | C.hatch | D.notice |
| 19.A.generally | B.sincerely | C.casually | D.deliberately |
| 20.A.distance | B.range | C.difference | D.interval |
| 21.A.amazing | B.annoying | C.satisfying | D.disturbing |
| 22.A.relax | B.recover | C.react | D.return |
| 23.A.appointment | B.excuse | C.idea | D.explanation |
| 24.A.fool | B.hurt | C.catch | D.kill |
| 25.A.reported | B.repeated | C.designed | D.approved |
| 26.A.confused | B.gone | C.tired | D.drunk |
| 27.A.gradually | B.luckily | C.strangely | D.finally |
| 28.A.single | B.small | C.local | D.new |
| 29.A.seldom | B.temporarily | C.merely | D.often |
| 30.A.sight | B.nature | C.ability | D.belief |
1.Like most creatures on earth,humans come with a circadian clock (生物钟).Even though an average adult needs eight hours of (41)B a night,there are"short sleepers",who need far (42)D sleep,and morning people,who always get up early.Then there are the rest of us,who (43)C alarm clocks to get up in the morning.
For those who want to get up early and don't depend on the alarm clock,there is(44)A.Actually,sleep experts say that with a little self-control,(45)B people can reset (重置) their circadian clocks.But it's not as simple as forcing yourself to go to(46)D earlier.You need to produce a sort of jet lag (时差) but you don't have to (47)C your time zone.And stick it out until your body (48)B resets itself.
To start,move up your wake-up time (49)C 20minutes a day.If you (50)B rise at 8a.m.,but really want to get up at 6a.m.,set the alarm for 7:40on Monday.The next day,set it for 7:20and so on.(51)D,after you wake up,don't (52)C in bed.In theory,you'll gradually get(53)B about 20minutes earlier each night.Besides,(54)B has a very special relationship with our brain.So turn off the computers and televisions to (55)D extra light exposure as it is near bedtime.
(56)C light exposure,another big(57)D for a would-be morning person is the weekend.Sleeping late on Saturday sends the (58)A an entirely new set of scheduling.By Monday,a 6a.m.alarm will feel like 4a.m.(59)B biology has a kind of memory of Saturday's staying-up late.This might totally(60)C a week's effort.
For those who want to get up early and don't depend on the alarm clock,there is(44)A.Actually,sleep experts say that with a little self-control,(45)B people can reset (重置) their circadian clocks.But it's not as simple as forcing yourself to go to(46)D earlier.You need to produce a sort of jet lag (时差) but you don't have to (47)C your time zone.And stick it out until your body (48)B resets itself.
To start,move up your wake-up time (49)C 20minutes a day.If you (50)B rise at 8a.m.,but really want to get up at 6a.m.,set the alarm for 7:40on Monday.The next day,set it for 7:20and so on.(51)D,after you wake up,don't (52)C in bed.In theory,you'll gradually get(53)B about 20minutes earlier each night.Besides,(54)B has a very special relationship with our brain.So turn off the computers and televisions to (55)D extra light exposure as it is near bedtime.
(56)C light exposure,another big(57)D for a would-be morning person is the weekend.Sleeping late on Saturday sends the (58)A an entirely new set of scheduling.By Monday,a 6a.m.alarm will feel like 4a.m.(59)B biology has a kind of memory of Saturday's staying-up late.This might totally(60)C a week's effort.
| 41.A.rest | B.sleep | C.exercise | D.work |
| 42.A.deeper | B.longer | C.more | D.less |
| 43.A.focus on | B.believe in | C.rely on | D.set in |
| 44.A.hope | B.doubt | C.difficulty | D.support |
| 45.A.other | B.most | C.few | D.no |
| 46.A.school | B.church | C.work | D.bed |
| 47.A.count | B.abandon | C.leave | D.forget |
| 48.A.shape | B.clock | C.building | D.language |
| 49.A.for | B.with | C.by | D.to |
| 50.A.rarely | B.regularly | C.constantly | D.temporarily |
| 51.A.Otherwise | B.However | C.Therefore | D.Then |
| 52.A.sleep | B.eat | C.stay | D.read |
| 53.A.awake | B.sleepy | C.tired | D.lazy |
| 54.A.bedtime | B.light | C.computer | D.television |
| 55.A.seek | B.ignore | C.shelter | D.avoid |
| 56.A.As for | B.Instead of | C.Apart from | D.Due to |
| 57.A.change | B.schedule | C.chance | D.challenge |
| 58.A.brain | B.soul | C.spirit | D.mind |
| 59.A.unless | B.because | C.although | D.until |
| 60.A.save | B.replace | C.ruin | D.reward |
20.For hundreds of years,people dreamed of being able to fly.Many of the early attempts at flight seem humorous today:people built wings and jumped off (41)C buildings,or tried to sh oot themselves (42)Bthe air with rockets.But all attempts were unsuccessful (43)Atwo French brothers thought of a new way,using(44)B.They believed that if balloons were filled with hot air,they would (45)B.They built a very large balloon and (46)Dthe air in it until the balloon (47)C a height of 1,800 metres.Then the air in the balloon cooled before the balloon slowly sank back to the ground.
The brothers'next balloon went up a few months later,with three animals (48)B to test the safety of this kind of flight.The balloon rose two and a half kilometres and (49)A safely.When this test was successful,the brothers knew they were (50)A to send up a human being.They put a man aboard,(51)C tied him to the earth so that he would not go too high.He rose only 25 metres.A month (52)B,two men went together and rose to a height of 900 metres,(53)D travelling over nine kilometres.They returned safely to earth,and the brothers were (54)Bto keep trying.
The success of balloons was (55)A they were used not only for sport and recreation but also had military applications and (56)B transport people over large distances.Some balloons travelled from Europe to America easily.Men made long,cigar-shaped balloons (57)D airships,and filled them with hydrogen.These airships were (58)A by engines and could be easily controlled.But hydrogen gas was found to be dangerous,because it could so easily (59)C.Accidents happened,including the intentional fire set on the Hindenburg.Many people died in these accidents,either burning or falling to their deaths.These accidents brought (60)A the hydrogen-filled airship but not to man's dream of flying.
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The brothers'next balloon went up a few months later,with three animals (48)B to test the safety of this kind of flight.The balloon rose two and a half kilometres and (49)A safely.When this test was successful,the brothers knew they were (50)A to send up a human being.They put a man aboard,(51)C tied him to the earth so that he would not go too high.He rose only 25 metres.A month (52)B,two men went together and rose to a height of 900 metres,(53)D travelling over nine kilometres.They returned safely to earth,and the brothers were (54)Bto keep trying.
The success of balloons was (55)A they were used not only for sport and recreation but also had military applications and (56)B transport people over large distances.Some balloons travelled from Europe to America easily.Men made long,cigar-shaped balloons (57)D airships,and filled them with hydrogen.These airships were (58)A by engines and could be easily controlled.But hydrogen gas was found to be dangerous,because it could so easily (59)C.Accidents happened,including the intentional fire set on the Hindenburg.Many people died in these accidents,either burning or falling to their deaths.These accidents brought (60)A the hydrogen-filled airship but not to man's dream of flying.
| 41.A.old | B.large | C.high | D.wooden |
| 42.A.by | B.into | C.with | D.to |
| 43.A.until | B.for | C.unless | D.though |
| 44.A.rockets | B.balloons | C.planes | D.fires |
| 45.A.explode | B.rise | C.fire | D.expand |
| 46.A.blew | B.found | C.filled | D.heated |
| 47.A.arrived | B.became | C.reached | D.raised |
| 48.A.abroad | B.aboard | C.broad | D.board |
| 49.A.returned | B.touched | C.succeeded | D.tried |
| 50.A.ready | B.willing | C.disappointed | D.lucky |
| 51.A.however | B.thus | C.but | D.even |
| 52.A.ago | B.later | C.after | D.before |
| 53.A.as | B.though | C.when | D.while |
| 54.A.forced | B.encouraged | C.surprised | D.refused |
| 55.A.such that | B.so as | C.as if | D.even though |
| 56.A.used to | B.were used to | C.got used to | D.were used for |
| 57.A.formed | B.produced | C.made | D.called |
| 58.A.powered | B.equipped | C.furnished | D.decorated |
| 59.A.set fire | B.be on fire | C.catch fire | D.be in fire |
| 60.A.an end to | B.benefit from | C.result of | D.consequence for |