Tài liệu Toefl cbt book part 44 docx

CD B, Track 5Narrator: Listen to the following discussion about cloud seeding.. Woman: Mainly because cloud seeding isn’t a proven science.. Narrator: What does the woman say has led to

CD B, Track 5

Narrator: Listen to the following discussion about cloud seeding.

Woman: The lack of rain in Florida has led to a renewed interest in the technology

of cloud seeding Have you heard of it before?

Man: Yes, actually We used to hear about it back in the ’70s and ’80s That’s a

good point Why don’t they do that?

Woman: Mainly because cloud seeding isn’t a proven science While some

scien-tists believe it works, there is no scientific proof that it does

Man: So what? It’s better than doing nothing, isn’t it?

Woman: It’s expensive The research has been very expensive and the act itself is

expensive They aren’t willing to take the effort and expense to do something they aren’t sure will work The authorities in Florida don’t believe in it

Man: How is cloud seeding supposed to work, at least according to those who do

believe in it?

Woman: Here’s a diagram The concept was created in 1946 by General Electric.

An agent, usually silver iodide, is deposited into a convective cloud, which is the type of white fluffy cauliflower-shaped cloud that generally leads to a storm cloud The agent provides a nuclei, or base, on which tiny water droplets can con-dense, and once there is enough condensation, the small droplets become larger droplets, then ice crystals, then snowflakes, and ultimately rain

Man: Don’t they use it for agricultural purposes in the Midwest? They think it

works

Woman: They do, but not everybody is convinced.

Man: It sure seems worth it to me to do whatever it takes to stop wildfires.

34. Narrator: What does the woman say has led to a new interest in cloud

seeding?

35. Narrator: Does the man indicate that he has heard of cloud seeding before?

36. Narrator: Why isn’t cloud seeding used to combat dry conditions?

37. Narrator: What does the man imply should be done?

38. Narrator: What is the correct order of the process for seeding a cloud?

39. Narrator: According to the speaker, into what is the iodide deposited?

40. Narrator: According to the woman, what is a nuclei?

Practice Test 5

Part A

CD B, Track 6

1. Woman: We’ve already seen both of these movies, haven’t we?

Man: I’m not sure Who’s in the action one?

Woman: Let’s see, uh, George Clooney Oh yeah, we saw it in a hotel How

about this one?

Man: Fine.

Narrator: What do the speakers think of the two movies they are

discussing?

2. Man: I think Ellen is going to enter the doctorate program in linguistics.

Woman: Don’t be so sure She’s been looking into the English literature

program

Man: Oh, I didn’t know that.

Narrator: What does the woman say about Ellen’s plans?

3. Woman: I thought Michael was as tall as Josh, but it looks like he’s a finger

shorter

Man: They were the same height, but Josh has grown a bit.

Woman: Actually, the doctor says Michael isn’t finished yet.

4. Man: There’s no way I’ll pass the test I haven’t had a chance to study at all.

Woman: You hardly studied last time, and you did fine.

Man: But that time, I was at least in a study group, so I was exposed to

everything

Narrator: What does the man imply about his lack of study for the test?

5. Man: This is the most favorable of all the lots available.

Woman: Do you think there’s room for the building, parking, and water

retention?

Man: Probably, but anyway, we would make the contract contingent on your

ability to build the building you need

Narrator: What does the man seem to think about the lot they are

discussing?

6. Man: You used to get away to your cottage quite a bit, as I recall Are you

still able to go as often with your new job?

Woman: Seldom I hope that changes soon, though.

Man: It’s a beautiful place, and it’s a shame not to be able to relax there Narrator: What does the woman say about her cottage?

7. Woman: Michelle is considering attending the University of North Florida

in Jacksonville

Man: Really? I thought she was already registered at the University of

Miami

Woman: That’s true, but she decided she didn’t want to be so far from home Narrator: What does the woman say about Michelle?

8. Woman: This is the last straw I have yet to see that new employee offer to

help anybody or do anything but sit there reading her novel

Man: I’m glad you realize it It was bugging me, too.

Narrator: What do the speakers imply about the new employee?

9. Woman: I’m going to start the research to do the optional paper Professor

Adams says he’ll throw out one test grade and replace it with the grade for a

paper, right?

Man: Yeah, that’s what he said, and I’m going to do it, too.

Narrator: What are the speakers thinking of doing?

10. Woman: I heard you dropped geometry Is that right?

Man: I just couldn’t follow it I needed something more basic.

Narrator: What do the speakers say that the man did?

11. Man: You’ve been to the races before, haven’t you?

Woman: No, not once.

Man: Oh, I must be thinking of someone else.

Narrator: What does the woman say about the races?

12. Man: Allison, did you get Nadia to work for you on Wednesday?

Woman: She couldn’t, but Dana might be able to.

Man: I’m sure somebody will be able to cover for you.

Narrator: What had the man assumed?

13. Man: I haven’t seen Christopher at a coin club meeting for a while.

Woman: He stopped coming because he said it was boring.

Man: He used to find it interesting People sure do change.

Narrator: According to the woman, why hasn’t the man seen Christopher?

14. Woman: Why don’t you let me help you with that?

Man: I can do it It’s just going to take a little more time.

Woman: I don’t know why you’re so stubborn.

Narrator: What does the woman imply about the man?

15. Man: I’ve been trying to figure out this program for hours.

Woman: Why not try reading the manual?

Man: That would be too easy No, you’re right I guess it’s time.

Narrator: What does the woman suggest that the man do?

Part B

CD B, Track 7

Narrator: Listen to the following speech about coral reefs.

Woman: This is a coral reef, which is a very important part of our environment,

not just for our personal enjoyment, but for many other reasons as well Coral reefs have suffered greatly in recent years, but they are making a comeback, thanks in part to a group of volunteers who make it their business to monitor and nurture them

The United States has 425,000 acres of coral reefs, the majority of which are in Hawaii Generally, coral grows about one inch a year Besides providing a habitat for lobsters, fish, and other sea life, coral reefs are important because they are used for bone grafts, for developing pesticides, and for providing natural break-waters to protect coasts from erosion They are also a natural source of beauty

Besides careless treatment by tourists and officials, one major problem for coral

reefs is the result of environmental changes In 1998, El Niño caused the warmest

ocean temperatures ever recorded, resulting in the death of necessary algae and,

ultimately, the bleaching of the coral itself The natural color of healthy coral reefs

comes from the algae, but the death of the algae bleaches them white The fact

that the damage generally appears closer to the surface is further proof that higher

temperatures are the cause of the problem

Because of the tremendous importance of coral reefs, the U.S government has

funded numerous projects to assist in bringing damaged reefs back to life We

aren’t out of the woods yet, but things are looking up for the reefs and the natural

inhabitants of them In 1998, it was determined that 15 percent of the world’s

reefs were dead, but lately, some have recovered As the reefs recover, the

inhabi-tants thrive again

16. Narrator: What does the woman say about the health of coral reefs since 1998?

17. Narrator: According to the woman, which of the following is not a reason

why coral reefs are important?

18. Narrator: What does the speaker describe as a major cause of coral reef death?

19. Narrator: What does the speaker describe as the relationship between coral

and algae?

20. Narrator: What has been done to improve the health of coral reefs?

CD B, Track 8

Narrator: Listen to the following conversation about student housing.

Man: Excuse me, I understand that this office helps students with housing Is that

right?

Woman: Are you a student in the intensive English program? May I see your ID

card? Um, yes, we can certainly help you Where are you staying now?

Man: I just arrived yesterday I’m staying at the hotel across the street.

Woman: Okay, please complete this form Will you be living alone or do you

have a family with you? Or, would you be interested in sharing housing?

Man: Yes, I have a wife and child They aren’t here yet, but they’ll be coming as

soon as I am settled in My daughter is 4

Woman: We have two choices available This two bedroom is two blocks from

campus, but it doesn’t have central heat and air There is a slot in the wall for a unit air conditioner if you want one It’s $500 a month Then, for $650 a month, there is this one It’s in a modern apartment complex, about 10 minutes from the university by bicycle, but it’s closer to shopping, a movie theater, and other things And the complex has a swimming pool and a Laundromat

Man: Could I see them both? I’m not sure which I would want at the moment.

Sure I’d love to be closer to school, but my wife and daughter would probably like the benefits of the other one

Woman: Sure We can go right now if you would like.

21. Narrator: Where is the man living currently?

22. Narrator: Who does the woman imply is eligible for help by her office?

23. Narrator: How does the woman seem to know the man is in the intensive

English program?

24. Narrator: What size apartment does the man say he needs?

25. Narrator: What does the man seem to think is the most important difference

between the two apartments the woman discusses?

26. Narrator: What does the woman imply is the biggest drawback of the less

expensive apartment?

CD B, Track 9

Narrator: Listen to the following talk about medical technology.

Man: Computers, wireless technology, and other innovations have changed our

lives in many ways Someday, intrusive medical procedures may be replaced with new technology For example, scientists have created a new camera that will re-mind you of a ride at Epcot Center They have invented a capsule containing a tiny camera, which is placed within the body and allowed to move through it, gathering information as it goes The most logical initial use for the camera is in the digestive system, since it has a beginning and an end, and the capsule will move through on its own

People with health problems in the esophagus, stomach, intestines, and colon cur-rently undergo invasive tests with instruments called endoscopes inserted through the nearest orifice

Such internal views are necessary when looking for abnormal blood vessels,

tu-mors, ulcers, lymphomas, and abnormalities of the various organ walls through

which the endoscope passes Skeptics point out that endoscopes have become

very sophisticated and allow much more control than the capsule allows For

ex-ample, a doctor can back up and aim at a particular area with an endoscope, which

will not be possible with the capsule Endoscopes even provide the ability to

per-form biopsies and other tests as well as surgical procedures, whereas the capsule

will not permit that But for simple viewing, endoscopes are uncomfortable, so

this new technology is believed to be a less intrusive choice

The capsule, no larger than a medicinal capsule, will be swallowed by the patient

and will light its way with built-in lights It will transmit video images in color as

it progresses through the body The video that it records can be up to five hours

long and is later downloaded to a computer for viewing

27. Narrator: Why does the speaker indicate that the digestive system is the

best place for the new technology?

28. Narrator: For which of the following items would the capsule not be

helpful?

29. Narrator: What is the main reason that some scientists believe the capsule

would be helpful?

30. Narrator: Which of the following does the speaker imply would not be part

of the capsule?

31. Narrator: Which of the following does the speaker imply is true?

CD B, Track 10

Narrator: Listen to the following conversation about Canavan Disease.

Man: I see that your husband is a Jew from Ashkenazi descent Has he ever been

tested for Canavan Disease?

Woman: What’s that?

Man: An inherited, degenerative disease, found most frequently among Jewish

families of Ashkenazi descent Children with the disease are severely disabled,

both mentally and physically, and have limited life spans Generally, they can’t

sit, crawl, walk, or speak They have very limited ability to move their hands, to

play, or to perform the simplest of tasks They gradually lose the ability to see and

to swallow food The disease affects the white matter of the brain, causing spongy

degeneration Victims can’t generate myelin, the white matter that insulates the

Myelin is a substance made up of proteins and lipids Its function is to protect nerves and allow messages to be sent to and from the brain The white matter de-teriorates because patients have a deficiency in a critical enzyme, which leads to the accumulation of a damaging chemical in the brain It is not exactly known how this chemical imbalance causes the destruction of myelin

Woman: I’ve never heard of anything like this at all And my husband has never

mentioned it

Man: Do you know your own heritage? You’re Jewish too, aren’t you?

Woman: Yes, I am But I don’t know any details like my husband does.

Man: The disease is inherited as an autosomal recessive trait Both of the parents

of an affected child are carriers of an altered gene on Chromosome 17, which is responsible for synthesizing the problematic enzyme A parent who is a carrier is healthy because he or she has one functional copy of the gene, which produces a sufficient amount of the enzyme A child who receives two altered copies of the gene, one from each parent, is unable to produce any of the enzyme and will de-velop the symptoms of the disease So if only your husband is a carrier, there’s no problem Only if both of you are carriers do we have to worry DNA testing of Ashkenazi Jewish couples can tell whether each parent is a carrier with more than

97 percent certainty If both parents are carriers, there is a 25 percent chance with each pregnancy that the child will have Canavan Disease

Woman: Oh, this is terrible I’m afraid.

Man: I’m sorry I’m only trying to take precautions If the two of you were

carri-ers and had children, that would be much more unpleasant, believe me

Woman: No, I’m sorry I do appreciate your concern We’ll be happy to participate.

Thank you

32. Narrator: What appears to be the woman’s level of knowledge of Canavan

Disease?

33. Narrator: According to the man, which of the following is possibly a carrier

of the illness?

34. Narrator: How does the man indicate that the disease affects the body?

35. Narrator: Why does the man want to know the woman’s cultural

background?

36. Narrator: What is the woman’s demeanor at the end of the discussion?

37. Narrator: What does the gene on Chromosome 17 do?

Practice Test 6

Part A

CD B, Track 11

1. Man: Where is Donna? I had expected her to be here this morning.

Woman: She was called away due to a family emergency.

Man: When will she be back?

Woman: She didn’t say, but I imagine she will call soon.

Narrator: Why does the woman say Donna is not present?

2. Woman: Are you going to the meeting at the library tonight?

Man: I may.

Woman: Well, I’m going Maybe I’ll see you there.

Narrator: What does the man mean?

3. Man: Had Jim submitted his application earlier, he could have gotten

financial aid

Woman: He always puts things off till the last minute.

Narrator: What does the man mean?

4. Woman: I didn’t pay as much for my books this semester as I did last

semester

Man: How’d you manage that? Prices are always higher.

Woman: I found a used book outlet You have to be careful to get the right

edition, but I found several and saved quite a bit