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A．relieve
B．deduct
C．minimize
D．rid
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更多“To weaken the damage for earthquakes, scientists are working on ways to enable accurate pr”相关的问题
第1题
A．It enabled the bank to retain customers at an acceptable rate.
B．It threatened to weaken the bank's competitive position with respect to other regional banks.
C．It had already been improved after having caused damage to the bank's reputation in the past.
D．It was slightly superior to that of the bank's regional competitors.
第2题
Insect pests die if they freeze, but many have the ability to become "supercool", remaining alive even when the temperature drops to - 10℃. However, Paul Fields of the Agriculture Canada Research Station in Winnipeg has discovered that the ability of these insects to supercool can be seriously affected by "ice-nucleating-active bacteria". When the bacteria are present, the insects freeze and die at a higher temperature than normal.
Ice-nucleating-active bacteria are found naturally on most plant leaves. They are also grown commercially for use in cloud seeding and in making artificial snow.
Fields added these bacteria to wheat which was stored at a temperature of - 10℃ and contained the rusty grain beetle. He found that when the bacteria accounted for only 10 parts per million of the grain, the beetles' supercooling point rose from - 11.3℃ to - 7.1℃, so more died. At concentrations of 100 ppm or 1000 ppm, the bacteria increased the supercooling point to as high as -6.3℃, which resulted in more than 75 percent of the beetles dying.
Fields also applied the bacteria to two other species of grain beetle, Sitophilus granarius and Oryzaephilus surinamensis, keeping them at - 10℃. He found that more of these beetles also died. First, though, he gradually acclimatized some of the insects to cold, to simulate the increase in tolerance to cold which they normally develop as winter approaches. Fields found that the insects that had been acclimatized were less affected by cold than the beetles that had not been acclimatized, but that more of them still died at - 10℃.
Fields says that the technique of using ice-nucleating-active bacteria leaves no noxious chemical residues and poses little risk to the people who apply the treatment. It is also effective against insects which have become resistant to pesticides.
Which of the following statements about ice-nucleating-active bacteria is true？
A．They may cool the grain to - 10℃.
B．They can weaken the beetles' resistance to coldness.
C．They can be grown on most plant leaves.
D．They are used only in biological researches.
第3题
请根据短文内容，回答题。
Music
Music is one of the most beautiful forms of artistic expressions ever invented. In movies and plays, music has an added function: it not only moves people but also can shock people.＜br＞
Our eardrums can withstand sound within 20 to 80 decibels (分贝 ) . Once sound exceeds this limit, even beautiful music will become car-splitting noise and harm health. A strong blast (响声 ) of high sound can twist and break a solid iron sheet. High sound of 150 decibels can kill a healthy rat.＜br＞
In movies, sometimes the hero can produce a sound that ordinary people can&39;t hear and only those who have the same ability can feel. In nature, there is actually sound that is beyond our hearing. In physics, the sound that exceeds 20,000 hz is called ultrasonic (超音波的). Dolphins, whales and bats can make such high-frequency sound. It does no harm to health.＜br＞
Sound less than 20 hz is called infrasonic (次声 ) waves. When we move, the air will vibrate.＜br＞
The vibration of air can produce infrasonic waves. As the frequency of infrasonic waves is close to that of people&39;s internal organs, infrasonic wave may cause resonance (共振) in human bodies. As a result, people&39;s vision may weaken and internal organs may rupture (断裂). However, whether an infrasonic wave can be used as a weapon depends on its intensity. If its intensity is very low, it won&39;t damage internal organs or a person&39;s health. If the intensity of infrasonic wave exceeds 160 decibels, it is extremely harmful. When wind blows at a force of 3 or 4 over the sea, it will produce infrasonic waves of several decibels. Only typhoons can produce infrasonic waves of over 100 decibels. At present, scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.
What could be the best title of the passage？ 查看材料
A.The power of music
B.The harms of noises
C.The magic of sound
D.The discovery of infrasonic waves
第4题
A．It may make the wearer feel tired.
B．It will gradually weaken the eyes of adults.
C．It can lead to the loss of vision in children.
D．It can permanently change the eye structure.
第5题
A．Y
B．N
C．NG
第6题
A．Y
B．N
C．NG
第8题
根据以下材料，回答题
The Magic of Sound
Music is one of the most beautiful forms of artistic expressions ever invented. In movies and plays， music has an added function: it not only moves people but also can shock people. Is it true that an ordinary musical instrument can be so powerful？
Our eardrums can withstand sound within 20 to 80 decibels. Once sound exceeds this limit，even beautiful music will become ear-splitting noise and harm health. A strong blast of high sound can twist and break a solid iron sheet. __________ （46）
The noise from a plane"s engine is over 140 decibels. However， the sound of a flute is at most a few decibels. __________ （47） It has been proven that people who have worked in an environment with a high sound intensity for a long time suffer varying degrees of heart disease or altered brain waves.
In movies， sometimes the hero can produce a sound that ordinary people can"t hear and only those who have the same ability can feel. In nature， there is actually sound that is beyond our hearing. In physics， the sound that exceeds 20，000 Hz is called ultrasonic. __________ （48） It does no harm to health.
Sound less than 20 Hz is called infrasonic waves. When we move， the air will vibrate. __________ （49）
As the frequency of infrasonic waves is close to that of people"s internal organs， infrasonic wave may cause resonance in human bodies. As a result， people"s vision may weaken and internal organs may rupture. However， whether an infrasonic wave can be used as a weapon depends on its intensity. If its intensity is very low， it won"t damage internal organs or a person"s health. __________ （50） When wind blows at a force of 3 or 4 over the sea， it will produce infrasonic waves of several decibels.
Only typhoons can produce infrasonic waves of over 100 decibels. At present scientist can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.
回答（46）题 查看材料
A.High sound of 150 decibels can kill a healthy rat.
B.The vibration of air can produce infrasonic waves.
C.We cannot play high-pitched music with ordinary musical instruments.
D.If the intensity of infrasonic wave exceeds 160 decibels， it is extremely harmful.
E.Dolphins， whales and bats can make such high-frequency sound.
F.Therefore， the sound of ordinary musical instruments cannot harm your health.
第9题
The word “sustain”(paragraph 2)could be best replaced by
A．“reduce”.
B．“shake”.
C．“maintain”.
D．“weaken”.
第10题
The word“sustain”（paragraph 2）could be best replaced by
A．“reduce”.
B．“shake”.
C．“maintain”.
D．“weaken”.
