题目内容
（请给出正确答案）
A.checked in
B.leave
C.checked out
D.arrived
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更多“He has__________ at Changi air…”相关的问题
He is used to flying by air and on no occasion ______ frightened.
A．he has ever felt
B．he ever feels
C．ever does he feel
D．has he ever felt
Johnson is used to flying by air and on no occasion frightened（）
A．he has ever felt
B．did he feel
C．has he ever felt
D．he ever feels
A.he has ever felt
B.did he feel
C.has he ever felt
D.he ever feels
A．Because he enjoys traveling from home to office everyday.
B．Because the city air is polluted.
C．Because he doesn't like the crowded houses and strange neighbors in the city.
D．Because he has a romantic feeling about nature.
Mr. Anderson used to (jogging) in the (early morning) air (during) (the winter months), but now he has stopped.
A．jogging
B．early morning
C．during
D．the winter months
A、made his living
B、found a successful career
C、found a position in life
D、earned a lot of money
A Canadian researcher has discovered that sound travels 【21】______ air more than one-half kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who learned they had been 【22】______ the wrong speed of sound for many years.
The speed of sound in air had been【23】______ to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, 【24】______ accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.
Doctor Wong is a member of the National Research Council of Canada. He was studying ways to 【25】______ exactly the sound created by microph ones. One of his experiments 【26】______ a number he could use to find the speed of sound. He was 【27】______ to learn that the speed of sound was slower than scientists had thought.
To explain the difference, Doctor Wong spent eighteen months 【28】______ past test research on the speed of sound. He finally found the 【29】______ of the difference. It was a mathematics mistake 【30】______ in Nineteen-Forty-Two by physicist H-C Hardy.
Doctor Wong's 【31】______ does not mean a big change for the science of sound. This is 【32】______ Doctor Hardy and Doctor Wong measured the speed of sound for what is called" standard air".
Standard air exists only 【33】______ thought. It is a way for scientists to agree 【34】______ the same speed of sound. 【35】______ the air around us, standard air always has a temperature of zero degrees Celsius and the same atmospheric pressure 【36】______ the air at sea level. Standard air always has same amounts of nitrogen, oxygen, carbon dioxide and 【37】______ gases. And in standard air, the speed of sound does not change.
The change in the new speed of sound is 【38】______ small to affect the work of most sound scientists and engineers. But scientists say Doctor Wong's discovery may 【39】______ improve instruments 【40】______ use the speed of sound to measure very short distances.
【21】
A．through
B．on
C．to
D．pass
M: No, I know I'll set off security alarm for sure. I have a steel plate in my arm from a rugby injury.
Q: Why will the man set off the alarm in the airport？
(17)
A．Because he is wearing jewelry.
B．Because he has keys in his pocket.
C．Because he has a mental plate in his bag.
D．Because he has a steel plate in his body.
The speed of sound in air had been 【23】______ to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, 【24】______ accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.
Doctor Wong is a member of the National Research Council of Canada. He was studying ways to 【25】______ exactly the sound created by microphones. One of his experiments 【26】______ a number he could use to find the speed of sound. He was 【27】______ to learn that the speed of sound was slower than scientists had thought.
To explain the difference, Doctor Wong spent eighteen months 【28】______ past test research on the speed of sound. He finally found the 【29】______ of the difference. It was a mathematics mistake 【30】______ in Nineteen-Forty-Two by physicist H-C Hardy.
Doctor Wong's 【31】______ does not mean a big change for the science of sound. This is 【32】______ Doctor Hardy and Doctor Wong measured the speed of sound for what is called " standard air".
Standard air exists only 【33】______ thought. It is a way for scientists to agree 【34】______ the same speed of sound. 【35】______ the air around us, standard air always has a temperature of zero degrees Celsius and the same atmospheric pressure 【36】______ the air at sea level. Standard air al ways have same amounts of nitrogen, oxygen, carbon dioxide and 【37】______ gases. And in standard air, the speed of sound does not change.
The change in the new speed of sound is 【38】______ small to affect the work of most sound scientists and engineers. But scientists say Doctor Wong's discovery may 【39】______ improve instruments 【40】______ use the speed of sound to measure very short distances.
【21】
A．through
B．on
C．to
D．pass
When we fly from east to west or【26】versa, the【27】we experience after taking a long distance flying is【28】, because we cross time zones. According to doctors, air travelers, after crossing several time zones, are in no【29】to go to work, and they should go【30】to bed【31】arrival.
As to airline pilots who often live【32】their own watches and ignore local time, there is no need for them to worry about their health although they sometimes have breakfast at midnight, because they are used to【33】and are【34】fit.
Many businessmen like long-distance flights, thinking they are【35】to have been chosen and they are out for promotion. They are lucky if the company follows the doctor' s advice and allow them to rest for a day or two【36】working. However, sometimes the manager is so energetic that he believes everyone is【37】to be as fit as he is. Since he has never felt【38】after flying himself, the work he assigns is so【39】that the employee is too【40】to carry the work out satisfactorily. That is disastrous for the employee' s health and the company' s reputation.
(21)
A．ordinary
B．common
C．plain
D．usual
In the second test, the test pilot must find out exactly what happens when all the engines are shut off at once. He takes the plane up very high. Then he shuts the engines off, the plane begins to fall like a stone. It is the pilot's job to find out how he can control the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.
What's the main topic of this passage？
A．The tests of new airliner before its flying.
B．How to protect a new airliner？
C．How to train a new pilot？
D．What the airliner engineers should do？
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