单选题As the plane flew off towards the mountains in the distance the sound of its engines gradually ______.A died awayB sank down C dropped offD went out

Text3 NASA has hired airplane manufacturer Lockheed Martin to build its next experimental plane,which is designed to fly faster than the speed of sound without producing the loud sonic booms that have plagued the transportation form.The plane is due to be delivered in 2021 and will cost just shy of$250 million.During a press conference hosted by the agency during which they announced the partnership,Lockheed Martin spokesperson Dave Richardson explained that the new plane will be neither a prototype for a new commercial airplane,nor a reincamation of previous supersonic jets."This is a purpose-built experimental research craft,"he said."This aircraft was designed from a clean sheet."NASA will use the plane to gather data about the impact ofits low-boom design,which the agency hopes will address the single biggest challenge of supersonic flight.Flying faster than the speed of sound produces shock waves that result in a loud booming sound."The air does not know that the airplane is coming,"Peter Coen,a NASA project manager for supersonic technology,explained during the press conference,Because no one liked hearing that noise,the Federal Aviation Administration and similar international organizations banned supersonic travel over land,Now,NASA thinks technology can break the sound barrier without being quite so loud about it.The secret is in the shape of the plane.Sonic booms form because the plane's flight produces many shock waves of different strengths headed in different directions that absorb into each other to create two strong pulses of pressure.From the testing done so far,NASA thinks the new plane's design successfully dissipates and weakens those shock waves,keeping them from forming the strong pulses responsible for booms.The plane would still produce what they've dubbed"sonic thumps,"but the hope is that those would be much easier to deal with.Once the new plane is built,NASA will run surveys on the ground to see how people respond to the sonic thumps.Then,the agency will bring that survey data to the Federal Aviation Administration and its intemational counterparts in order to revisit the rule about breaking the speed of sound over land."It's not about making a new airplane for airplanes'sake,although I love airplanes,"Richardson said."It's about the data that will be collected."If the rule change does come through,that could kick off a new era of commercial supersonic travel.33.Sonic booms result from

A.the shape ofplane.
B.the sonic thumps.
C.the strong pulses.
D.the sound barrier.

This species has nearly died out because its habitat is being destroyed.

A:turned dead
B:passed by
C:carried away
D:become extinct

It was Ann′s first experience of flying..She had always been afraid of heights and so was prepared?to be frightened.Only the fact that she was going to meet her son who she had not seen for?three years had given her the courage to make the flight.
She sat in her seat,her hands gripping its arms,her seat belt already fastened.The air hostess?was talking,telling everyone what to do in case of emergency,showing them where their life-jackets?were.The plane was crowded,and every seat was full.From her window seat,getting out in a hurry?would be impossible,thought Ann.In any case who would want to get out of a plane in mid-air?
The engines began to shake--the noise increased till it was like a great rushing wind.She?looked out to see the runway slip past at astonishing speed.She wanted to cry out--to stop the plane?before it left the ground,but she knew she was trapped in this great roaring machine.I must scream,she told herself,and put her hands over her eyes.
There was a strange feeling as if she were going up in a lift.The noise died down.Carefully she?opened her eyes.Through the window she saw a great carpet of cloud above,so beautiful that she?stared in wonder,hardly turning away from the window till they touched down.


How was Ann sitting before the plane took off?《》（）

A.With her arms folded.
B.With her seat belt undone.
C.Holding tight to her seat belt.
D.Holding on to part of the seat.

It was Ann′s first experience of flying..She had always been afraid of heights and so was prepared?to be frightened.Only the fact that she was going to meet her son who she had not seen for?three years had given her the courage to make the flight.
She sat in her seat,her hands gripping its arms,her seat belt already fastened.The air hostess?was talking,telling everyone what to do in case of emergency,showing them where their life-jackets?were.The plane was crowded,and every seat was full.From her window seat,getting out in a hurry?would be impossible,thought Ann.In any case who would want to get out of a plane in mid-air?
The engines began to shake--the noise increased till it was like a great rushing wind.She?looked out to see the runway slip past at astonishing speed.She wanted to cry out--to stop the plane?before it left the ground,but she knew she was trapped in this great roaring machine.I must scream,she told herself,and put her hands over her eyes.
There was a strange feeling as if she were going up in a lift.The noise died down.Carefully she?opened her eyes.Through the window she saw a great carpet of cloud above,so beautiful that she?stared in wonder,hardly turning away from the window till they touched down.


How did Ann feel after she had opened her eyes?《》（）

A.Very much pleased.
B.Very much frightened.
C.Greatly attracted.
D.Greatly surprised.

This species has nearly died out because its habitat is being destroyed.

A:turned dead
B:passed by
C:carried away
D:become extinct

Text3 NASA has hired airplane manufacturer Lockheed Martin to build its next experimental plane,which is designed to fly faster than the speed of sound without producing the loud sonic booms that have plagued the transportation form.The plane is due to be delivered in 2021 and will cost just shy of$250 million.During a press conference hosted by the agency during which they announced the partnership,Lockheed Martin spokesperson Dave Richardson explained that the new plane will be neither a prototype for a new commercial airplane,nor a reincamation of previous supersonic jets."This is a purpose-built experimental research craft,"he said."This aircraft was designed from a clean sheet."NASA will use the plane to gather data about the impact ofits low-boom design,which the agency hopes will address the single biggest challenge of supersonic flight.Flying faster than the speed of sound produces shock waves that result in a loud booming sound."The air does not know that the airplane is coming,"Peter Coen,a NASA project manager for supersonic technology,explained during the press conference,Because no one liked hearing that noise,the Federal Aviation Administration and similar international organizations banned supersonic travel over land,Now,NASA thinks technology can break the sound barrier without being quite so loud about it.The secret is in the shape of the plane.Sonic booms form because the plane's flight produces many shock waves of different strengths headed in different directions that absorb into each other to create two strong pulses of pressure.From the testing done so far,NASA thinks the new plane's design successfully dissipates and weakens those shock waves,keeping them from forming the strong pulses responsible for booms.The plane would still produce what they've dubbed"sonic thumps,"but the hope is that those would be much easier to deal with.Once the new plane is built,NASA will run surveys on the ground to see how people respond to the sonic thumps.Then,the agency will bring that survey data to the Federal Aviation Administration and its intemational counterparts in order to revisit the rule about breaking the speed of sound over land."It's not about making a new airplane for airplanes'sake,although I love airplanes,"Richardson said."It's about the data that will be collected."If the rule change does come through,that could kick off a new era of commercial supersonic travel.32.The crucial factor in the sound barrier breaking technology is

A.how to create the strong pulses of pressure.
B.how to shape the experimental plane.
C.how to run the surveys mentioned.
D.how to produce the sonic thumps.

This species has nearly died out because its habitat is being destroyed.

A:turned dead
B:passed by
C:carried away
D:become extinct

共用题干
Narrow Escape
We had left the hut too late that morning. When we stepped outside,the sky beyond the mountains to our east was already livid with colour. It meant the day would be a hot one,and the warmth would loosen rocks that were gripped by ice.
As soon as we stepped out on to the face,it became obvious this was going to be an awkward route. The main problem was talus,the debris that collects on mountainsides. Talus is despised by mountaineers for two reasons. First,because it can easily be pushed off on to you by people climbing above. And second,because it makes every step you take insecure.
For about 30 minutes we moved steadily up the face. The rock was in poor condition, shattered horizontally and mazed with cracks. When I tried to haul myself up on a block of it,it would pull out towards me,like a drawer opening. My hands became progressively wetter and colder. Then came a shout.“Cailloux!Cailloux!”I heard yelled from above,in a female voice. The words echoed down towards us. I looked up to see where they had come from.
There were just two rocks at first,leaping and bounding down the face towards us,once cannoning off each other in mid-air. And then the air above suddenly seemed alive with falling rocks,humming through the air and filling it with noise. Crack,went each one as it leapt off the rock face,then hum-hum-hum as it moved through the air,then crack again. The pause between the cracks lengthened each time,as the rocks gained momentum and jumped further and further. I continued to gaze up at the rocks as they fell and skipped towards me. A boy who had been a few years above me at school had taught me never to look up during a rock fall.“Why?Because a rock in your face is far less pleasant than a rock on your helmet,”he told us.“Face in,always face in.”
I heard Toby,my partner on the mountain that day,shouting at me. I looked across. He was safe beneath an overhanging canopy of rock. I could not understand him. Then I felt a thump,and was tugged backwards and round,as though somebody had clamped a heavy hand on my shoulder and turned me to face them. A rock had hit the lid of my rucksack.
I looked up again. A rock was heading down straight towards me. Instinctively,I leant backwards and arched my back out from the rock to try to protect my chest. What about my fingers,though,I thought:they'll be crushed flat if it hits them,and I'll never get down. Then I heard a crack directly in front of me,and a tug at my trousers,and a yell from Toby. “Are you all right?That went straight through you.”The rock had pitched in front of me, and passed through the hoop of my body,between my legs,missing me but snatching at my clothing as it went.
Toby and I had spent the evening talking through the events of the morning:What if the big final stone hadn't leapt sideways,what if I'd been knocked off,would you have held me, would I have pulled you off?A more experienced mountaineer would probably have thought nothing of it.I knew I would not forget it.

The first reason given to explain why mountaineers hate talus is______.
A: that climbers above you might cause it to fall on you
B: that it allows people climbing above you to push off
C: that it makes people climbing above you feel insecure
D: that it can cause other people to push you off the mountain

It was Ann′s first experience of flying..She had always been afraid of heights and so was prepared?to be frightened.Only the fact that she was going to meet her son who she had not seen for?three years had given her the courage to make the flight.
She sat in her seat,her hands gripping its arms,her seat belt already fastened.The air hostess?was talking,telling everyone what to do in case of emergency,showing them where their life-jackets?were.The plane was crowded,and every seat was full.From her window seat,getting out in a hurry?would be impossible,thought Ann.In any case who would want to get out of a plane in mid-air?
The engines began to shake--the noise increased till it was like a great rushing wind.She?looked out to see the runway slip past at astonishing speed.She wanted to cry out--to stop the plane?before it left the ground,but she knew she was trapped in this great roaring machine.I must scream,she told herself,and put her hands over her eyes.
There was a strange feeling as if she were going up in a lift.The noise died down.Carefully she?opened her eyes.Through the window she saw a great carpet of cloud above,so beautiful that she?stared in wonder,hardly turning away from the window till they touched down.

Ann thought she would be frightened because__________《》（）

A.she had never flown before
B.she had a fear of being in high places
C.she hadn't made proper preparations
D.she was naturally timid

It was Ann′s first experience of flying..She had always been afraid of heights and so was prepared?to be frightened.Only the fact that she was going to meet her son who she had not seen for?three years had given her the courage to make the flight.
She sat in her seat,her hands gripping its arms,her seat belt already fastened.The air hostess?was talking,telling everyone what to do in case of emergency,showing them where their life-jackets?were.The plane was crowded,and every seat was full.From her window seat,getting out in a hurry?would be impossible,thought Ann.In any case who would want to get out of a plane in mid-air?
The engines began to shake--the noise increased till it was like a great rushing wind.She?looked out to see the runway slip past at astonishing speed.She wanted to cry out--to stop the plane?before it left the ground,but she knew she was trapped in this great roaring machine.I must scream,she told herself,and put her hands over her eyes.
There was a strange feeling as if she were going up in a lift.The noise died down.Carefully she?opened her eyes.Through the window she saw a great carpet of cloud above,so beautiful that she?stared in wonder,hardly turning away from the window till they touched down.


Why did Ann want to scream?《》（）

A.Because the plane didn't leave the ground.
B.Because she couldn't make the plane stop.
C.Because she couldn't hear the wind.
D.Because she couldn't see the runway.

The amendment will remove the inconsistency between the two laws.

A:took away
B:left aside
C:took off
D:washed off