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更多“Letting a hundred flowers blossom and a hundred schools of thought contend is the policy f”相关的问题
One hundred online courses make fl Harvard education_________ worldwide．
A．valuable
B．allowable
C．accessible
D．knowledgeable
To fight a noise by making more noise sounds strange, but that' s exactly what motor engi-neers are doing in Germany and some other countries．
Carmaker' s research and development laboratories have already proved that mixing more noisewith the help of loudspeakers can reduce the unwanted noise．Physicists have known about thetechnique for a long time．Sound is made up of pressure waves in the air．If two sound waves ofthe same frequency(频率) mix so that the highest point of one wave happens at the same time asthe lowest point of the other wave, the result is no sound．Therefore, by producing a perfect copyof the noise and delaying it by half a wave cycle (周期), we can kill the unwanted noise．Usingthis technique many carmakers are racing to develop noise killing systems (系统) both inside andoutside the cars．
Another good thing about the use of noise killing systems is that it saves the need for a silencer;this not only reduces the weight of a car, but also makes the motor burn less fuel and work better．
Some engineers believe that the noise killing system will be used in most cars within a fewyears．But the carmakers haven' t decided if they will carry it into production because it would addseveral hundred dollars to the cost of their cars．
Which of the following gives a general idea of how the noise killing system works？ 查看材料
A.By producing pressure waves going in the opposite direction．
B.By mixing high frequency sound waves with low frequency sound waves．
C.By mixing new sound waves with the noise and sending them out together．
D.By making copies of the unwanted sound waves and letting them out a little later．
Car makers' research and development laboratories have already proved that mixing more noise with the help of loudspeakers can reduce the unwanted noise.
Physicists have known about the technique for a long time. Sound is made up of pressure waves in the air. If two sound waves of the same frequency(频率) mix so that the highest point of one wave happens at the same time as the lowest point of the other wave, the result is no sound. Therefore ,by producing a perfect copy of the noise and delaying it by half a wave cycle(周期), we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise-killing systems(系统)both inside and outside the cars.
Another good thing about the use of noise-killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor burn less fuel and work better.
Some engineers believe that the noise-killing system will be used in most cars within a few years. But the carmakers haven't decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.
Which of the following gives a general idea of how the noise-killing system works？
A．By producing pressure waves going in the opposite direction.
B．By mixing high frequency sound waves with low frequency sound waves.
C．By mixing new sound waves with the noise and sending them out together.
D．By making copies of the unwanted sound waves and letting them out a little later.
Car makers' research and development laboratories have already proved that mixing in more noise with the help of loudspeaker can reduce the unwanted noise.
Physicists have known about the technique for a long time. Sound is made up of pressure waves in tire air. If two sound waves of the same frequency mix so that the highest point of one wave happens at the same time as the lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of the noise and delaying it by half a wave cycle, we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise-killing systems both inside and outside the cars.
Another good thing about the use of noise-killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor burn less fuel and work better.
Some engineers believe that the noise-killing system will be used in most cars within a few years. But the carmakers haven't decided if they will put it into production because it would add several hundred dollars to the cost of their cars.
Which of the following gives a general idea of how the noise-killing system works？
A．By producing pressure waves going in the opposite direction.
B．By mixing high frequency sound waves with low frequency sound waves.
C．By mixing new sound waves with the noise and sending them out together.
D．By making copies of the unwanted sound waves and letting them out a little later.
听力原文： The idea of fighting a noise by making more noise sounds strange, but that's exactly what motor engineers are doing in Germany and some other countries.
Carmaker's research and development laboratories have already proved that mixing in more noise with the help of loudspeakers can reduce the unwanted noise.
Physicists have known about the technique for a long time. Sound is made up of pressure waves in the air. If two sound waves of the same frequency mix so that the highest point of one wave happens at the same time with the lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of the noise and delaying it by half a wave cycle, we can kill the unwanted noise. Using this technique many carmakers are racing to develop noise-killing systems both inside and outside the cars.
Another good thing about the use of noise-killing systems is that it saves the need for a silencer, which not only reduces the weight of a car, but also makes the motor burn less oil and work better.
Some engineers believe that the noise-killing system will be used in most cars in 1996. But the carmakers haven't decided if they will put it into production because it would add several hundred dollars to the cost of their cars.
(30)
A．By mixing high frequency sound waves with low frequency sound waves.
B．By producing pressure waves going in the opposite direction.
C．By mixing new sound waves with the noise and sending them out together.
D．By making copies of the unwanted sound waves and letting them out a little later.
D
To fight a noise by making more noise sounds strange, but that ' s exactly what motor engi-
neers are doing in Germany and some other countries.
Carmaker ' s research and development laboratories have already proved that mixing more noise
with the help of loudspeakers can reduce the unwanted noise. Physicists have known about the tech-
nique for a long time. Sound is made up of pressure waves in the air. If two sound waves' of the
same frequency(频率） mix so that the highest point of one wave happens at the same time as the'
lowest point of the other wave, the result is no sound. Therefore, by producing a perfect copy of
the noise and delaying it by half a wave cycle(周期) ,we can kill the unwanted noise. Using this
technique many carmakers are racing to develop noise killing systems(系统) borh inside and outside
the cars.
Another good thing about the use of noise killing systems is that it saves the need for a silencer; this not only reduces the weight of a car, but also makes the motor bum less fuel and work better. Sorpe engineers believe that the noise killing system will be used in most cars within a few
years. But the carmakers haven' t decided if they will carry it into production because it would add several hundred dollars to the cost of their cars.
69. Which of the following gives a general idea of how the noise killing system works？
[ A]By producing pressure waves going in the opposite direction.
[ B ] By mixing high frequency sound waves with .low frequency sound waves.
[C]By mixing new sound waves with the noise and sending them out together.
[D]By making copies of the unwanted sound waves and letting them out a little later.
Each human being is born as something new,__ (71)__ that never existed before. He is born with__ (72)__ he needs to win at life. Each person in his own__ (73)__ can see,hear,touch,taste, and think__(74)__ himself. Each has his own unique __(75)__ — his capabilities and limitations.__ (76)__ can be a significant,__ (77)__, aware, and creatively __(78)__ person in his own right a winner.
The words “winner” and “loser” have many meanings. When we refer __(79)__ a person as a winner, we do not mean one__ (80)__ beats the other guy__ (81)__ winning over him and __(82)__ him lose. To us, a winner is one who responds authentically by being __ (83)__ , trustworthy, responsive, and genuine,__ (84)__ as an individual and as a member of__ (85)__.
A loser is one who fails to respond authentically. Martin Buber __(86) __this idea as he retells an old story of a rabbi who on his __(87)__ bed sees himself as a loser. The rabbi laments that, in the world to come, he will not be asked why he wasn't Moses; he will be asked why he wasn't __(88)__. Few people are one hundred percent winners or one hundred percent losers. It's a__ (89)__ of degree. However, once a person is on the road to being a winner, his chances are greater for becoming even more __(90)__. This book is intended to facilitate the journey.
71. A) everything B) anything C) something D) thing
72. A) that B) what C) which D) how
73. A) way B) case C) method D) appetite
74. A) of B) to C) for D) about
75. A) possibilities B) abilities C) potentials D) energy
76. A) One B) All C) Every D) Each
77. A) thinking B) think C) thought D) have thought
78. A) produce B) productive C) product D) productivity
79. A) as B) to C) for D) on
80. A) what B) those C) which D) who
81. A) with B) for C) on D) by
82. A) making B) let C) letting D) make
83. A) credit B) believing C) credible D) believed
84. A) all B) both C) which D) each
85. A) society B) group C) community D) party
86. A) takes B) tells C) speaks D) expresses
87. A) die B) death C) dying D) died
88. A) his B) him C) himself D) self
89. A) matter B) case C) thing D) something
90. A) than B) much C) then D) so
听力原文： Researching friendship，psychologist Lillian Rubin spent two years interviewing more than two hundred women and men. No matter what their age，their sex，the results were completely clear. Women have more friendships than men，and the difference in the content and the quality of those friendships is“marked and unmistakable”.
More than two-thirds of the single men，Rubin interviewed，could not name a best friend. Those who could were likely to name a woman. Yet three-quarters of the single women had no problem naming a best friend，and almost always it was a woman. More married men than women named their wife/husband as a best friend，most trusted person，or the one they would turn to in time of emotional distress. “Most women. ”says Rubin，“identified at least one，usually more，trusted friends to whom they could turn to in a troubled moment，and they spoke openly about the importance of these relationships in their lives. ”
“In general，”Rubin writes in her new book，“women's friendships with each other rest on shared emotions and support，but men's relationships are marked by shared activities. ”“Even when a man is said to be a best friend，”Rubin writes，“the two share little about their innermost feelings. Whereas a woman's closest female friend might be the first to tell her to leave fl failing marriage，it wasn't unusual to hear a man say he didn't know his friend's marriage was in serious trouble until he appeared one night asking if he could sleep on the sofa. ”
(33)
A．Men spend more nights in their friends'home than women．
B．Women are much more talkative than men．
C．Women enjoy more and better friendships than men．
D．Men have more difficulty remembering names than women．
A.letting, up on
B.to let, /
C.to let, up with
D.letting, up for
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