理工類-概括大意（2月9日）_職稱英語(yǔ)網(wǎng)校

概括大意與完成句子

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 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 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 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 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.

1. Paragraphs 1 & 2 _____

2. Paragraph 3__________.

3. Paragraph 4__________.

4. Paragraph 5__________.

A. Digital code has wide applications.

B. Floppy disks are outdated.

C.CDs are durable.

D.CD's working principle is explained.

E.CD-RWs play better than CD-ROMs.

F.CDs are of many formats.

【正確答案】 DAFC

【答案解析】 1. D

本題是問(wèn)第一段和第二段的主旨大意。通過(guò)閱讀第一段和第二段，可以明顯的看出來(lái)，這兩段是在解釋CD的工作原理的，從a digital code到sound的發(fā)出，因此本題應(yīng)該選D，即“解釋CD的工作原理”。

2.A

通過(guò)第三段的第一句話：Digital codes are used with many technologies.可以得出，本段是在闡述digital codes的廣泛用途的。緊接著，用不同的實(shí)例去說(shuō)明digital codes的用途。

3.F

同理，本題的答案也可以從段落的首句得出：There are many types of compact disks.是說(shuō)，CD有多種類型，多種格式，如：CD-RWs，CD-ROM等。故選F。

4.C

第五段段落很短，但每句都是在說(shuō)CD使用的年限很長(zhǎng)，比較耐用，即These CDs still play well and sound fine. Current CDs are expected to last between 70 to 200 years.因此本題的答案為C，durable表示“經(jīng)久耐用的”。

5. One advantage of CD-RWs is that they can __________ like floppy disks.

6. The author predicts it will not __________ before a new technology is invented for music recording.

7. The laser beam-emitting device and the receiver are considered to __________ of a CD player.

8. Space probes could not __________ without using digital codes.

A. shine on bumps

B. take many more years

C. be the key parts

D. restore the original code

E. be written on and rewritten on

F. keep contact with their ground station efficiently

【正確答案】 EBCF

【答案解析】 5.E

本題可以從第四段的第二句話找出答案：One format is called CD-RWs. They can be recorded on and re-recorded on (rewritten on) as you would do with a floppy disk. 尤其是括號(hào)里給出的單詞，根據(jù)同義重現(xiàn)，因此選E。

6.B

本題也是細(xì)節(jié)題，可以從最后一段的第二個(gè)句子得出答案：It may not be many more years before a completely new technology is invented and introduced to the public for music recording.很明顯，原句復(fù)現(xiàn)，答案為B。

7.C

本題從原文中是找不到原句和答案的，屬于總結(jié)概括題。主要依據(jù)是第一段和第二段，CD的工作原理涉及到The laser beam-emitting device and the receiver，它們是CD運(yùn)行不可或缺的裝置。觀察選項(xiàng)，通過(guò)逐一排除，選項(xiàng)C. be the key parts是符合題意的，即“CD的關(guān)鍵裝置。

8.F

本題可以從第三段的第三句得出答案：Space probes communicate with their ground station on earth using digital codes. 航天探測(cè)器需要用數(shù)碼與地面衛(wèi)星接收站進(jìn)行聯(lián)系溝通，因此沒(méi)有digital codes，就不能有效的進(jìn)行溝通，故答案為F。