In 1953，a mountain climber reported seeing a ...

In 1953，a mountain climber reported seeing a bar-headed goose soar over the peak of Mount Everest (珠穆朗玛 ).　 It was thought impossible.　 Now researchers who raised 19 of the geese—named for the black stripes on the backs of their heads—have shown the birds really fly so high.

The team trained the youngsters to fly in a large wind tunnel wearing backpacks and face masks full of sensors that recorded their heart rate. blood oxygen levels, temperature, and metabolic rate—how many calories they burned per hour. The researchers simulated(模拟)10w-, medium-, and high-altitude conditions by altering the concentration of oxygen supplied to face masks worn by each goose as it flew in the tunnel.

Birds already have a better heart and lungs than mammals for sustained physical activity. And researchers knew that bar-headed geese have even larger, thinner lungs that let them breathe more deeply and an even bigger heart to pump more oxygen to muscles than other birds.

The wind tunnel experiments showed that when the concentration of oxygen was at its lowest-like the 7% found on top of Mount Everest versus 21% at sea level—the geese's heart rate and frequency of wing beats remained the same even as their metabolic rate dropped. Somehow, the birds managed to cool down their blood-the measured blood temperature droppedso it could take in more oxygen, the researchers report today in eLife. This cooling likely helps compensate for the very thin air, the team says.

Although well trained, the birds were only willing to stay in the air a few minutes-or Iesswhen wearing their backpacks and flying at 6ihigh" altitudes. So it's not clear whether these adaptations alone are what make it possible to fly the 8 hours it takes to climb over Mount Everest. But those few minutes showed these geese really could fly over the top of Mount Everest.

1.Why did the researchers raise 19 bar-headed geese and train them?

A.To test the flying height and speed of them.

B.To confirm they could fly over Mount Everest.

C.To observe them flying through the wind tunnel.

D.To see how many calories they burned per hour.

2.What can we learn from the wind tunnel experinent?

A.It was carried out at very high altitude.

B.The geese managed to breathe less when their blood decreased.

C.The geese could live through the lowest concentration of oxygen.

D.It shows the geese could fly at high altitude for long.

3.What still puzzles scientists about the geese?

A.Whether they have super hearts and lungs.

B.Whether they have muscles pumped more oxygen to.

C.Whether they are willing to wear backpacks and face masks.

D.Whether they can manage to fly 8 hours to climb over Mount Everest.

4.Where does the text most probably come from?

A.A science fiction.

B.A climbing guide.

C.A travel brochure.

D.A science report.

高三英语阅读理解困难题查看答案及解析

The climbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______.

A. make　　　　　　         B. had made　　　         C. made　　　　　　     D. have made

高三英语单项填空中等难度题查看答案及解析

It is reported that some wild animals were found ____ in a big cave in the mountain.

A. to hide dead        B. hidden dead           C. hiding dead          D. hidden death

高三英语单项填空中等难度题查看答案及解析

It is reported that some wild animals were found ____ in a big cave in the mountain.

A. to hide dead    B. hidden dead   C. hiding dead            D. hidden death

高三英语单项填空简单题查看答案及解析

Bobby the mountain climber was famous for his attempts to climb the big snowy mountain. He had tried it at least thirty times, but had always failed halfway.

For the sake of ________ Bobby to try again, Old Peeper, the town optician, who bore witness to his ________, presented him with a pair of ________ sunglasses. "If it starts clouding over or if your feet start hurting, put on these glasses. They'll help you.” Bobby accepted the ________ without giving it much mind, but when his feet started _________ again he remembered his words and put on the glasses. Then ________ came as usual in the form of cloud cover, but seemingly not so thick this time. So Bobby ________climbing, leaving the clouds behind, forgetting his ________, and finally arriving at the summit. It was ___________ worth it. His feeling of triumph was ________, almost as magnificent as that wonderful ________. Resplendent in its silence, the mountain below was surrounded by a dense sea of clouds. Bobby didn't remember the clouds being as ________ as that, so he looked more closely at the sunglasses, and ________ everything.

Peeper had carved a light ________ on the lenses (镜片), in the form of the snow-covered summit. It was made in such a way that you could only ________ it if you looked upwards. Peeper had understood that whenever Bobby lost sight of his ________, he would similarly lose sight of his dream, and his ________ to continue would weaken.

Bobby realised that the only obstacle to reaching the summit had been his own _______. When he could no longer see the top of the mountain, the problems ________. He thanked Peeper for using that little ________ to help him see that his aims were not impossible, and that they were still there, where they had always been.

1.A.convincing B.encouraging C.educating D.entertaining

2.A.practice B.disadvantage C.growth D.failure

3.A.special B.beautiful C.fancy D.expensive

4.A.gift B.challenge C.award D.request

5.A.breaking B.damaging C.aching D.swelling

6.A.danger B.adventure C.pressure D.misfortune

7.A.quitted B.kept C.accomplished D.abandoned

8.A.problem B.pain C.injury D.anxiety

9.A.normally B.practically C.certainly D.exactly

10.A.incomparable B.invisible C.undesirable D.unmeasurable

11.A.experience B.attempt C.view D.present

12.A.white B.thin C.dark D.thick

13.A.recognized B.grasped C.believed D.acknowledged

14.A.image B.spot C.photo D.message

15.A.move B.feel C.change D.see

16.A.objective B.power C.success D.journey

17.A.preference B.will C.competence D.concentration

18.A.mistake B.prejudice C.ignorance D.discouragement

19.A.set off B.cut in C.set in D.showed off

20.A.technology B.tool C.trick D.mark

高三英语完形填空中等难度题查看答案及解析

It is reported that some wild animals were found _______ in a big cave in the mountain.

A. to hide dead                           B. hidden dead

C. hiding dead                            D. hidden death

高三英语单项填空中等难度题查看答案及解析

After 1953 _______ people have succeeded in climbing the mountain.

A. several hundred of B. several hundreds C. several hundreds of  D. several hundred

高三英语单项填空中等难度题查看答案及解析

Climbing Without Ropes

The popular image of the mountain climber is of a person carefully climbing a steep cliff with a network of safety ropes, but it is not the only kind. Many climbers now enjoy bouldering. It’s more accessible and better for the environment.

Here is an example of a climber addressing a bouldering problem.

Figure 1: The climber has two routes she could take, one to the left and one to the right. The left one appears easier because it has a jug within easy reach, but look what happens if she chooses that direction. She gets stuck on the rock and has to go back down. Sometimes that is even more difficult than going up.

Figure 2: The climber takes the one to the right this time. Using a foothold and placing her right hand in a crimp, she is able to lift herself up and locate other handholds. After only a few moves, she is able to throw her leg over the top of the boulder and pull herself up.

1.According to the passage, bouldering ________.

A.is an indoor sport B.has no safety protection

C.needs maps and equipment D.is a steep cliff climbing

2.Bouldering becomes popular because ________.

A.it challenges the limits B.it costs less

C.it builds minds and bodies D.it is a team game

3.According to the example, the right route is ________.

A.a shortcut B.a dead end

C.tough but to the top D.lined with jugs

4.The passage is likely to appear in ________.

A.a book review B.a science report

C.a newspaper advertisement D.a sports magazine

高三英语阅读理解中等难度题查看答案及解析

Climbing Without Ropes

The popular image of the mountain climber is of a person carefully climbing a steep cliff with a network of safety ropes, but it is not the only kind. Many climbers now enjoy bouldering. It’s more accessible and better for the environment.

Here is an example of a climber addressing a bouldering problem.

Figure 1: The climber has two routes she could take, one to the left and one to the right. The left one appears easier because it has a jug within easy reach, but look what happens if she chooses that direction. She gets stuck on the rock and has to go back down. Sometimes that is even difficult than going up.

Figure 2: The climber takes the one to the right this time. using a foothold and placing her right hand in a crimp, she is able to life herself up and locate other handholds. After only a few moves, she is able to throw her leg over the top of the boulder and pull herself up.

1.According to the passage, bouldering ________.

A.is an indoor sport B.has no safety protection

C.needs maps and equipment D.is a steep cliff climbing

2.Bouldering becomes popular because ________.

A.it challenges the limits B.it costs less

C.it builds minds and bodies D.it is a team game

3.According to the example, the right route is ________.

A.a shortcut B.a dead end

C.tough but to the top D.lined with jugs

高三英语阅读理解中等难度题查看答案及解析

Climbing Without Ropes

The popular image of the mountain climber is of a person carefully climbing a steep cliff with a network of safety ropes, but it is not the only kind. Many climbers now enjoy bouldering. It’s more accessible and better for the environment.

Here is an example of a climber addressing a bouldering problem.

Figure 1: The climber has two routes she could take, one to the left and one to the right. The left one appears easier because it has a jug within easy reach, but look what happens if she chooses that direction. She gets stuck on the rock and has to go back down. Sometimes that is even more difficult than going up.

Figure 2: The climber takes the one to the right this time. Using a foothold and placing her right hand in a crimp, she is able to lift herself up and locate other handholds. After only a few moves, she is able to throw her leg over the top of the boulder and pull herself up.

1.According to the passage, bouldering ________.

A. is an indoor sport　　 B. has no safety protection

C. needs maps and equipment　　 D. is a steep cliff climbing

2.Bouldering becomes popular because ________.

A. it challenges the limits　　 B. it costs less

C. it builds minds and bodies　　 D. it is a team game

3.According to the example, the right route is ________.

A. a shortcut　　 B. a dead end

C. tough but to the top　　 D. lined with jugs

4.The passage is likely to appear in ________.

A. a book review　　 B. a science report

C. a newspaper advertisement　　 D. a sports magazine

高三英语阅读理解中等难度题查看答案及解析