题目内容
（请给出正确答案）
CDs can last a long time if__________. 查看材料
A.they are seldom used
B.they play well and sound fine
C.their users take good care of them
D.they are developed with new technology
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更多“CDs can last a long time if__________. 查看材料A.they a”相关的问题
听力原文： A certificate of deposit (CD) is a time deposit with a bank. Time deposits may not be withdrawn on demand like a check account. CDs are generally issued by commercial banks but they can be bought through brokerages. They bear a specific maturity date that usually lasts from 3 months to 5 years, a specified interest rate, and can be issued in any denomination, very similar to bonds. CDs offer a slightly higher yield than T-Bills because of the slightly higher default risk for a bank, but overall the likeliness of a large bank going broke is pretty slim. Of course, the amount of interest you earn depends on a number of factors such as the current interest rate environment, how much money you invest, the length of time, and your specific bank.
24. What is a CD？
25.Which of the followings generally issue CDs？
26.How long does a specific maturity usually last？
27.Why do CDs pay higher return to investors than T-bills？
(24)
A．A term deposit that can be drawn at any time.
B．A time deposit with a bank.
C．A current deposit.
D．A cheek account.
Compact Disks
1 If someone says to you your music CDs don’t really hold any musicon them，and they only have numbers recorded 0n them，you may not helieve it． In fact，he is right in that sound is actuallv reoorded onto the CDs as special numbers—a digital code． The code is pressed onto the CD as bumps on a long spiral traek almost five kilometers long．These bumps an average of 0．5 microns wide
2 A small laser hearn shines onto the bumps as the CD turns．The light is renected back to a reeeiver that reeords how the laser light bounces hack． This Iets the CD player turn the refleeted light back int0 the 0riginal code．This means you can hear the original code as music．
3 Digital codes are used with many technologies．E—mail needs these kinds of code numhers．Space probes communicate with their ground station on earth using digital codes．Bar codes are read as digital codes 1n computer systems．Digital communications with celJ phones need digital eodes．Weather radios also tune in t0 specinc signals using these codes．
4 There are many types of compact disks．0ne fommt is called CD—RWs．Thev can be reeorded 0n and re—recorde on（rewritten on）as you Would do with a floppy disk．Another format is the CD—ROM．The technology for recordjng on these disks is different from 0ther CDs．These CDs have a dye layer that the CD writer can darken or leave clear．The clear and dark spots are the digitaleode.CD—ROM stands fnr Compact Disc—Read 0nly Memory．This（1isk is like a“super"noppy disk that can hold 10ts of information．One CD—ROM can hold the same amount 0f data as 500 floppy disks. Information is permanently recorded onto it．Computer gaines and other programs are considered t0 he CD—ROMs．
5 CDs were first sold to the public in 1982．These CDs still play well and sound fine．Current CDs are expected to last between 70 to 200 years．0f course，you can make sure your CDs last a long time by taking care of them．
6 Science keeps 0n developing．It may not be many more years before a completelv new tech．nology is inventefr and introdliced t0 the puhlic for music reeording．In the meantime．there is no doubt you wiIl continue t0 enjoy Iilstenmg to your favorite music 0n CDs6 and playing your favorite computer games on CD—ROMs．
第 23 题 Paragraphs l&2________.
Compact Disks
1 If someone says to you your music CDs don&39;t really hold any music on them, and they only have numbers recorded on them, you may not believe it. In fact, he is right in that sound is actually recored onto the CDs as special numbers --a digital code. The code is pressed onto the CD as bumps on a long spiral track almost five kilometers long. These bumps are an average of 0.5 microns wide.
2 A small laser beam shines onto the bumps as the CD turns. The light is reflected back to a receiver that records how the laser light bounces back. This lets the CD player turn the reflected light back into the original code. This means you can hear the original code as music.
3 Digital codes are used with many technologies. E-mail needs these kinds of code numbers. Space probes communicate with their ground station on earth using digital codes. Bar codes are read as digital codes in computer systems. Digital communications with cell phones need digital codes. Weather radios also tune in to specific signals using these codes.
4 There are many types of compact disks. One format is called CD-RWs. They can be&39; recorded on and re-recorded on (rewritten on) as you would do with a floppy disk. Another format is the CD-ROM. The technology for recording on these disks is different from other CDs. These CDs have a dye layer that the CD writer can darken or leave clear. The clear and dark spots are the digital code. CD-ROM stands for Compact Disc -- Read Only Memory. This disk is like a "super" floppy disk that can hold lots of information. One CD-ROM can h01d the same amount of data as 500 floppy disks. Information is permanently recorded onto it. Computer games and other programs are considered to be CD-ROMs.
5 CDs were first sold to the public in 1982, These CDs still play. well and sound fine. Current CDs are expected to last between 70 to 200 years. Of course, you can make sure your CDs last a long time by taking care of them.
6 Science keeps on developing. It may not be many more years before a completely new technology is invented and introduced to the public for music recording. In the meantime, there is no doubt you will continue to enjoy listening to your favorite music on CDs and playing your favorite computer games on CD-ROMs.
Paragraphs 1 & 2 ______
A Digital Code Has Wide ApplicationsB Floppy Disks Are OutdatedC CDs Are DurableD CD&39;s Working Principle Is ExplainedE CD-RWs Play Better Than CD-ROMsF CDs Are of Many Formats
Paragraph 3 ______
A Digital Code Has Wide ApplicationsB Floppy Disks Are OutdatedC CDs Are DurableD CD&39;s Working Principle Is ExplainedE CD-RWs Play Better Than CD-ROMsF CDs Are of Many Formats
Paragraph 4 ______
A Digital Code Has Wide ApplicationsB Floppy Disks Are OutdatedC CDs Are DurableD CD&39;s Working Principle Is ExplainedE CD-RWs Play Better Than CD-ROMsF CDs Are of Many Formats
Paragraph 5 ______
A Digital Code Has Wide ApplicationsB Floppy Disks Are OutdatedC CDs Are DurableD CD&39;s Working Principle Is ExplainedE CD-RWs Play Better Than CD-ROMsF CDs Are of Many Formats
One advantage of CD-RWs is that they can ______ like floppy disks.
A shine on bumpsB take many mom yearsC be the key partsD restore the original codeE be written on and rewritten onF keep contact with their ground station efficiently
The author predicts it will not ______ before a new technology is invented for music recording.
A shine on bumpsB take many mom yearsC be the key partsD restore the original codeE be written on and rewritten onF keep contact with their ground station efficiently
The laser beam-emitting device and the receiver are considered to ______ of a CD player.
A shine on bumpsB take many mom yearsC be the key partsD restore the original codeE be written on and rewritten onF keep contact with their ground station efficiently
Space probes could not ______ without using digital codes.
A shine on bumpsB take many mom yearsC be the key partsD restore the original codeE be written on and rewritten onF keep contact with their ground station efficiently
请帮忙给出每个问题的正确答案和分析，谢谢！
Compact Disks
1 If someone says to you your music CDs don’t really hold any music on them，and they only have numbers recorded on them，you may not believe it．In fact，he is right in that sound is actually recorded onto the CDs as special numbers-a digital codel。The code is pressed onto the CD as bumps on a long spiral track almost five kilometers long． These bumps are an average of 0.5 microns wide
2 A small laser bearn shines onto the bumDs as the CD turns．The light is reflected back to a receiver that records how the laser light bounces back．This lets the CD player2 turn the reflected light back into the original code．This means you can hear the original code as music．
3 Digital codes are used with many technologies．E-mail needs these kinds of code numbers．Space probes cornmunicate with their ground station on earth using digital codes．Bar codes are read as digital codes in computer systerns．Digital communications with cell phones need digital codes．Weather radios also tune in to specific signals using these codes．
4 There are many types of compact disks．One format is called CD—RWs．They can be recorded on and re—recorded on(rewritten on)as you would do with a floppy disk3．Another format is the CD—ROM。The technology for recording on these disks is different from other CDs．These CDs have a dye layer that the CD writer can darken or leave clear．The clear and dark spots are the digital code．CD—ROM stands for Compact Disc—Read Only Memory4。This disk is like a“super”floppy disk that can hold lots of information．One CD—ROM can hold the same amount of data as 500 floppy disks．Information is permanently recorded onto it．Computer games and other programs are considered to be CD—ROMs．
5 CDs were first sold to the public in l982．These CDs still play well and sonnd fine．Current CDs are expected to last between 70 to 200 years．Of course，you can make sure your CDs last a long time by taking care of them．
6 Science keeps on developing．It may not be many more years before a completely new technology is invented5 and introduced to the public for music recording。In the meantime，there is no doubt you will continue to enjoy listening to your favorite music on CDs6 and playing your favorite computer games on CD—ROMs．
词汇：
bump n．隆块，隆起 floppy disk软(磁)盘
spiral adj．螺旋形的 format n．格式
probe n．探测器dye n．染色
floppy adj．松软的Permanently adv．永久地
注释：
1．he is right in that sound is actually rdcorded onto the CDs as special numbers—a digital code：他说的对，因为实际上声音以特殊的数字的形式，即数码，刻录在CD碟片上。in that是“因为”，如：Water is essential in that without it all living things would die．(水是基本要素，因为没有水，所有生物都要死亡。)
2．CD player：CD播放机
3．as you would do with a floppy disk：就象你使用软磁盘一样
4．CD—ROM stands for Compact Disc—Read Only Memory"：CD—ROM是Compact Disc—Read Only Memory这五个词首字母的组成的缩写词。
5．It may not be many more years before a completely new technology is invented：过不了几年，说不定又会发明一种全新的技术…。many more years是“再过许多年”。
6．“there is no doubt you will continue to enjoy listening to your favorite music on CDs”语法上可以理解为“there is
no doubt(about the fact that)you will continue to enjoy listening to your favorite music on CDs”。
练习：
第 38 题 Paragraph 2__________
A．Digital code has wide applications．
B．Floppy disks are outdated。
C．CDs are durable．
D．CDs working principle is explained．
E．CD-RWs play better than CD—ROMs．
F．CDs are of many formats．
The president can not answer questions as to______.
A．how long will the disaster last
B．how long does the disaster last
C．how long the disaster will last
D．how long the disaster lasts
In the last paragraph, we can find that grandfathers ______.
A．have long air
B．do not comb their hair
C．do not dress their hair
D．behave informally
Some expensive drugs can be economical______.
A．at long last
B．in the long way
C．in the long run
D．at long length
According to the passage, will the love for physical exercise last long for Americans？
A．Yes
B．No
C．Somebody can tell
D．It is hard to tell
It can be inferred from the last paragraph that
A．the dram to build interplanetary Internet can be fulfilled in the future
B．interplanetary Internet will become commercialized in 100 years.
C．the research of Internet took 50 years.
D．it will take a long time to build interplanetary Internet.
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