题目内容
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The sound from the wastebasket was made by ______.
A．some mice
B．the waste paper
C．the basket
D．Walt Disney
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A．constructed
B．instituted
C．confirmed
D．given up
From Henning's results we can see that______.
A．beginners have difficulty distinguishing the pronunciation of words
B．advanced students remember words by their meaning
C．it is difficult to remember words that sound alike
D．it is difficult to remember words that have the same meaning
The first and most obvious thing is that a dictionary will【23】you the spelling of a word. If you' re not sure about the spelling of a word, you can try to find the correct spelling in a dictionary. Words are listed in alphabetical order--a, b, c, and so on .For example, on a dictionary page the word "poor" p, o, o, r--comes before "poverty"--p, o, v, e, r, t, y and the word "poverty" comes【24】the word "power'--p, o, w, e, r. The words are always given in alphabetical Order.
The second thing a dictionary will tell you is【25】. Most dictionaries give the pronunciation of a word in a special kind of alphabet. This special alphabet is called a phonetic, or sound alphabet. The phonetic spelling will tell you generally【26】a word is pronounced. There are a few different phonetic alphabets. Many dictionaries use the International Phonetic Alphabet to show pronunciation.
The【27】thing a dictionary will tell you is the meanings of words. You can【28】a word and find out what it means. Many words have more than one meaning, and a good dictionary will ex plain all of the word' s meanings. For example, in English the common word" get" has over 20 different meanings. The meaning, of course,【29】the sentence in which the word' is used.
These three things--spelling, pronunciation, and meanings--are some of the important【30】that you learn from dictionaries.
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A．books
B．people
C．things
D．thing
We can infer from this passage that______.
A. people cannot sent visible information until 19th century
B. we cannot communicate without sound
C. the ways of communication are similar in different countries
D. in ancient time, enough people is necessary to send messages over distance
A.be less powerfull
B.travel much quickly
C.move less quickly
D.have to travel a greater distance
A sound is a pressure disturbance: a sonic boom, like other explosive sounds, is the result of an abrupt change in pressure. An airplane in subsonic flight produces weak changed in pressure, but because these disturbances travel at the speed of sound, they move faster than the airplane and stay in front of it. In effect, these disturbances warn the air to get out of the way, and the an does just jet, however, gets ahead of its own pressure disturbances. Consequently a wave of suddenly com pressed air--a shock wave--builds up and is thrown off like the wave ;hat spreads from the bow of a speedboat.
Can sonic booms be eliminated？ The answer is a categorical negative--they are an innerent(内在的) part of supersonic flight--but the sonic boom probably can be reduced; government and private research is now under way to improve understanding of the sonic boom. If and when the booms can be reduced to tolerable levels, commercial supersonic transports can come rata service.
Before commercial airliners travel faster than sound, problems must 0e solved regarding ______.
A．design
B．Construction
C．operation
D．all of the above
It's similar to an ordinary record，except that it's read by a laser beam，and the information recorded on the aluminium is digital.
The makers claim that a CD can reproduce the original sound perfectly，without any distortion or background hiss. As the system is computerized，there's no loss of quality between the studio master and the record you buy.
Also，a CD is much tougher-than a vinyl(乙烯基)record，so it doesn't need such careful handling. Dust and dirt won't damage it，and as there's no contact between the laser and the disc, it will never wear out.
Most musicians agree that the best violins(小提琴) were made in Cremona, Italy, about 200years ago. They even sound better than violins made today. Violin makers and scientists try to makeinstruments(乐器)like the Italian violins,however,they are not the same. Why are these old Italianviolins so special？ No one really knows. But many people think they have an answer.
Some people think it is the age of the violins. But there is a problem here. Not all old violins sound wonderful. Only the old violins from Cremona are special. So age cannot be the answer.
Other people think the secret to those violins is the wood. It must be from certain kinds of trees.It must not be too young or too old. Perhaps the violin makers of Cremona knew something specialabout wood for violins.
But the kind of wood may not be so important. It may be more important to cut the wood in aspecial way. Wood for a violin must be cut into the right size and shape. The smallest difference willchange the sund of the violin. Musicians sometimes think that this is the secret of the Italians.
Size and shape may not be the answer either. Scientists make new violins that are exactly the same size and shape. But the new ones still do not sound as good as the old ones. Some scientiststhink the secret may be the varnish (清漆).It makes the wood look shiny, but it also helps the soundof the instrument. Since no one knows what the Italian violin makers used in their varnish, no one canmake the same varnish today.
There may never be other violins like the violins of Cremona. And there are not many of the old violins left. So these old violins from Cremona become more and more precious. What would be the best title for the text？
A.The Secrets of Cremona Violins.
B.The History of Cremona Violins.
C.The Making of Italian Violins.
D.The Studies of Italian Violins.
What is still not clear about Cremona violins？A.The shape
B.The wood
C.The size
D.The varnish
Which of the following Words can best describe Cremona violins？A.Light
B.Shining
C.Valuable
D.Modern
请帮忙给出每个问题的正确答案和分析，谢谢！
During a cattle drive, cowboys took a group of cows from a wild and open country to
A．the West states and Texas
B．the cities of the East States
C．the people who eat beef in the cities
D．the railroad towns hundred miles away
W: I got a terrible e-mail from Vincent. He doesn’t want to be my friend any more.
M: That must be hard on you. Cheer up! I’ll be with you.
Why did the woman get sad？
A.Because she received an apology letter.
B.Because she felt sick.
C.Because she lost a friend of hers.
D.Because she lost her mail.
A.that
B.those
C.ones
D.one
