Only after much heated discussion, （他们才得出结论)____________.

Part B

Directions: You will hear four dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE.

听力原文： Although the Arabian camel or dromedary can go without food for a long while, its hump does not store water as is commonly believed. The real secret of the animal's unusual ability to store water lies in the fact that very little of the camel's water is lost by evaporation through the skin. Instead of sweating out great quantities of water, the camel's body temperature rises, sometimes as much as eleven degrees, to compensate for external heat. When a camel does require water it replaces only the amount lost since its last drink.

In Egypt, between November and April, the camel can go for three or four months without drinking if it grazes in lush pastures where dew and showers keep the vegetation green, If only dry feed is available, the camel will get thirsty after several weeks—even during January.

The length of time a camel can go without drinking is greatly determined by time of year, force of wind, heat in the air, intensity of sunlight, amount of reflected heat, kind of feed, weight of the load carried, speed the animal travels and number of hours spent daily in travel.

What is the purpose of this passage？

A．Entertain.

B．Disprove a belief.

C．Give information on life in Egypt.

D．Compare camels with other animals.

.

A.flushing with chemical solvent without being dismantled

B.brushing mechanically after being disassembled

C.flushing with flesh water only

D.flushing with clean oil only

the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form. nuclei of helium, and, in doing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converts into helium in the Sun every second. This the Sun has been doing thousands of millions of years.

The nuclear energy is released at the Sun's center as high-energy gamma radiation, a form. of electro magnetic radiation like light as radio waves, only of every much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be reemitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the x-ray part of the spectrum, eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space, without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat is emitted in such directions that, after passing unhindered through interplanetary space, it hits the Earth.

What does the passage mainly discuss？

A．The production of solar light and heat.

B．The physical and chemical nature of life.

C．The conversion of hydrogen to helium.

D．Radiation in the x-ray part of the spectrum.

n denture base acrylic resin()

A．no residual monomer exists after processing a heat activated acrylic resin at 165℃ for 8 hours

B．more residual monomer exists in a denture that is processed by chemical activation than by heat activation

C．residual monomer in a denture can only be eliminated by raising the temperature to 212℃ for 1 hour after processing．

D．excessive brittleness

听力原文： Lions are opportunists. They prefer to eat without having to do too much work. When resting in the shade, they are also watching the sky to see what is flying by, and even in the heat of the day they will suddenly start up and run a mile across the plains to find out what is going on. If another animal has made a kill, they will drive it off and take the kill for themselves. A grown lion can easily eat 60 pounds of meat at a single feeding. Often they eat until it seems painful for them to lie down. The lionesses(the females), being thinner and faster, are better hunters than the males. But the males don't mind. After the kill they move in and take the best share.

Most kills are made at night or just before daybreak. We have seen many, many daylight attempts but only ten kills. Roughly, it's about twenty daytime attempts for one kill.

When lions are hiding for an attack by a water hole, they wait patiently and can charge at any second. The kill is the exciting moment in the day-to-day life of the lion, since these great animals spend most of their time, about 20 hours a day, sleeping and resting.

Lions are Social cats, and when they are having a rest, they love to touch each other. After drinking at a water hole, a lioness rests her head on another's back. When walking, young lions often touch faces with older ones, an act of close ties among members of the group.

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A．Because lions are cruel animals.

B．Because lions are clever animals.

C．Because lions like to take every chance to eat.

D．Because lions like to take advantage of other animals.

Section B

Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听力原文： Global warming is caused by an increase in the greenhouse effect. The greenhouse effect is not a bad thing by itself--it's what allows Earth to stay warm enough for life to survive.

You can think of the Earth sort of like your car sitting out in a parking lot on a sunny day. You've probably noticed that your car is always much hotter inside than the outside temperature if it's been sitting there for a while. The sun's rays enter through your car's windows. Some of the heat from the sun is absorbed by the seats, the dashboard and the carpeting and floor mats. When those objects release this heat, it doesn't all get out through the windows. So a certain amount of energy is going in, and less energy is going out. The result is a gradual increase in the temperature inside your car.

When the sun's rays hit the Earth's atmosphere and the surface of the Earth, approximately 70 percent of the energy stays on the planet, absorbed by land, oceans, plants and other things. The other 30 percent is reflected into space by clouds, snow fields and other reflective surfaces. But even the 70 percent that gets through doesn't stay on earth forever. The things around the planet that absorb the sun's heat eventually radiate that heat back out. Some of it makes it into space, and the rest of it ends up getting reflected back down to earth when it hits certain things in the atmosphere, such as carbon dioxide, methane gas and water vapor. The heat that doesn't make it out through Earth's atmosphere keeps the planet warmer than it is in outer space, because more energy is coming in through the atmosphere than is going out. This is all part of the greenhouse effect that keeps the Earth warm.

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A．It enables Earth to stay warm enough for life to survive.

B．It makes your car much hotter inside than outside.

C．It can improve human living standard.

D．It can absorb the sun's rays.

A．Superconductors have much lower electrical resistance than common electrical conductors.

B．Superconductors are more durable than common electrical conductors.

C．Superconductors convert greater amounts of electrical energy into waster heat.

D．Superconductors produce only some waste heat

The passage supports which of the following conclusions？

A．Clay deposits are only found deep in the Earth.

B．If clay contains too much iron it will melt when fired.

C．Only certain types of clay are appropriate for making china teacups.

D．If sufficient heat is applied, all clay will become nonporous.

Section B

Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听力原文： Many people believe they are supposed to drink eight glasses of water a day, or about two liters. Why？ Because that is what they have been told all their life. But a new report offers some different advice. Experts say people should obey their bodies; they should drink as much water as they feel like drinking.

The report says most healthy people meet their daily needs for liquid by letting thirst be their guide. The report is from the Institute of Medicine, part of the National Academies. This organization provides scientific and technical advice to the government and the public.

The report contains some general suggestions. The experts say women should get about two-point- seven liters of water daily. Men should get about three-point-seven liters. But wait--in each case, that is more than eight glasses.

There is an important difference. The report does not tell people how many glasses of water to drink. In fact, the experts say it may be impossible to know how many glasses are needed to meet these guidelines. This is because the daily water requirement can include the water content in foods. People do not get water only by forcing themselves to drink a set number of glasses per day. People also drink fruit juices and sodas and milk. They drink coffee and tea. These all contain water.

As you might expect, the Institute of Medicine says people need to drink more water when they are physically active. The same is true of those who live in hot climates. Depending on heat and activity, people could need two times as much water as others do.

26. What does the new report advise people to do？

27.What function of the Institute of Medicine is mentioned in the passage？

28.Why do experts claim it impossible to know how many glasses of water are needed per day？

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A．Drink at least two liters of water a day.

B．Drink as much water as possible dally.

C．Drink as much water as their bodies need.

D．Drink no water before physical exercises.

From the last paragraph we know that a pop singer ______.

A．can relax only after he is successful

B．must pay much attention to his clothes

C．can enjoy his life at will

D．is often annoyed by his fans