How many types can the packing be classified into？

ere any comments about it？

M: Well, to begin with, I was surprised to find out there was so much going on in bones. I always assumed they were pretty lifeless.

W: Well, that's an assumption many people make. But the fact is bones are made of dynamic living tissue that requires continuous maintenance and repair.

M: Right. That's one of the things I found so fascinating about the article the way the bones repair them selves.

W: Ok. So can you tell us how the bones repair them selves.

M: Sure. See, there are two groups of different types of specialized cells in the bone that work together to do it. The first group goes to an area of the bone that needs repair. This group of cells produces the chemical that actually breaks down the bone tissue, and leaves a hole in it. After that' the second group of specialized cells comes and produces the new tissue that fills in the hole that was made by the first group.

W: Very good. This is a very complex process. In fact, the scientists who study human bones don't completely understand it yet. They are still trying to find out how it all actually works. Specifically, be cause sometimes after the first group of ,cells leaves a hole in the bone tissue, for some reason, the second group doesn't completely fill in the hole. And this can cause real problems. It can actually lead to a disease in which the bone becomes weak and is easily broken.

M: Ok, I get it. So if the scientists can figure out what makes the specialized cells work, maybe they can find a way to make sure the second group of cells completely fills the hole in the bone tissue every time. That'll prevent the disease from ever occurring.

(23)

A．How bones help the body move.

B．How bones continuously repair themselves.

C．The chemical composition of human bones.

D．Two different types of bones in the human body.

A.expect

B.estimate

C.overestimate

ch time.

M: Rachel, you know how well I type. I wouldn't exactly do you a favor.

Q: What does the man imply？

(14)

A．The man dare not face Rachel because he refuses to help.

B．The man types well but is unwilling to help.

C．The man doesn't think he would be of much help.

D．The man doesn't have enough time, so he can't help her.

听力原文：M: Sue, how do you decide what time to show a program？

W: Well, it depends on the program. We look for different types of programs for different times of the day. For example, at breakfast time, we show short news and interview program. People don't watch for long in the morning, so everything must be very short.

M: And what happens later？

W: Well, we plan programs around what people are usually doing. We have to think about prime time.

M: Prime time--what's that, exactly？

W: Prime time is the time when the largest number of people is watching TV. In this country, that's from 6 p.m. to 11 p.m. Most people have come home from work and they're relaxed.

M: And, what programs do you show then？

W: We usually show new TV series which most people like. You see, before 9 p.m., we try to show programs for everybody.

M: Oh, I see.

W: And we also need to think about the ratings.

M: Can you tell us about that？

W: Well, the ratings tell us how many people are watching each program.

M: Oh, how do you know that？ You can't ask everybody!

W: No, of course not. Well, most TV stations buy information from an audience research company. They ask a small number of people -- perhaps a few hundred-- to keep a record of what they watch. Then that gives them an idea of what everybody watches.

M: Are ratings very important？

W: Very important. Our television company is commercial. We make money by selling advertising time. If our ratings are high, we can ask a higher price for advertising time. So we're always trying to increase our ratings.

M: So in a way, the advertisers Control what you show on television.

W: Um, not directly, but in a way, yes.

(30)

A．TV series.

B．News broadcasting.

C．Football game.

D．A lively talk show.

One cell has 2 TRXs (14 timeslots used for TCH).How many Erlang can this cell carry if the QoS (blocking rate) is 2%？ （）

A.2.7 Erlang

B.8.2 Erlang

C.16.0 Erlang

D.14.0 Erlang

r to do other things,【C2】______. Can we use the sun's【C3】______energy to supply electricity, or at least to perform. the function which electricity or other types of power usually perform？ The answer is【C4】______.

For example, people have for many years been using the【C5】______heat of the sun to cook by solar【C6】______which have been built with several incurred【C7】______reflecting the sun and focusing the heat on the cooking element. This【C8】______can be used like a gas or electric stove; it is more expensive to make but it doesn't need any【C9】______and so costs【C10】______to use. Another【C11】______of using solar energy is in house heating.

The【C12】______of energy we use most is electricity, and every day more is【C13】______. But electricity has to be made too, and to make it huge quantities of fuel is required -- oil, coal, gas and nowadays even uranium.

The question which【C14】______everyone today is: how long will these fuels【C15】______？ Nobody knows it for sure,【C16】______most experts think it will soon be difficult to obtain sufficient electricity from these sources. It is possible that the sun can make a(n)【C17】______here, too.

Solar power has already been used to produce【C18】______heat. In Southern France a solar furnace has been built,【C19】______temperatures reach more than 3 000 centigrade. This furnace is not only used for experiment【C20】______, but could be used to produce steam for a power station.

【C1】

A．power

B．time

C．heat

D．temperature

听力原文：W: Come on, Ray. You can' t just turn your back on me now. You would save me so much time.

M: Rachel, you know how well I type. I wouldn't exactly do you a favor.

Q: What does the man imply？

(14)

A．The man dare not face Rachel because he refuses to help.

B．The man types well but is unwilling to help.

C．The man doesn' t think he would be of much help.

D．The man doesn' t have enough time, so he can' t help her.

听力原文：M: Let's see now. They can park fifteen cars in that back lot, can't they？

W: Oh, didn't you know？ They've doubled the capacity.

How many cars can be parked in the back lot？

A．A total of 15.

B．A total of 30.

C．A total of 50.

请根据短文内容，回答题。

Compact Disks

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 recorded onto the CDs as special numbers--a digital code. The code is pressed onto the CD as bumps (隆起 )on a long spiral track almost five kilometers long. These bumps are an average of 0.5 microns (微米) wide.＜br＞

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.＜br＞

Digital codes are used with many technologies. E-mail needs these kinds of code numbers.＜br＞

Space probes (探测仪) 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.＜br＞

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 (软盘). 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＜br＞

considered to be CD-ROMs.＜br＞

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.＜br＞

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.

Music is recorded onto CDs as __________. 查看材料

A.laser beams

B.digital codes

C.musical notes

D.special sounds