The sun ______ in the east.A．risesB．will riseC．would rise

Paragraph 6__________ 查看材料

A.Nuclear reactions as the lasting source of the sun"s energy

B.The most important source of energy

C.Types of electromagnetic energy

D.The machines used for energy generation

E.Seeking new sources of energy

F.The use of ultraviolet radiation in medicine

We can learn from the passage that the shoot system of the perennials ______.

A．can help the perennials absorb less of the sun's ray

B．decides the appearance of the perennials in desert

C．limits the function of the perennials' branches

D．may prevent the perennials from losing much water

Paragraph 4__________ 查看材料

A.Nuclear reactions as the lasting source of the sun"s energy

B.The most important source of energy

C.Types of electromagnetic energy

D.The machines used for energy generation

E.Seeking new sources of energy

F.The use of ultraviolet radiation in medicine

回答题。

When the sun started to set, Jim headedfor home. He had hunted long enough. Just then he saw there is, 30 feet in front of him, a wolf.

Jim looked around. There were other wolfs in the76.__________

woods in his right, who were waiting for their77.__________

leader move. The boy did not lift his gun. His78.__________

heart beaten like a drum (鼓). Jim walked on79.__________

with the leader wolf in front and others behind following him.80.__________

The leader wolf was full of the fright in back of Jim. Suddenly Jim81.__________

turned back and shot at the front wolf. Then the others82.__________

stopped short, and Jim started to ran. He looked back 83.__________

and saw the beasts stand around the dead body of84.__________

their leader. Without their leader, they wereso brave. 85.__________

第76题__________

查看材料

回答题。

Electromagnetic Energy

1. White light seems to be a combination of all colors. The energy that comes from a source of light is not limited to the kind of energy you can see. Heat is given off by a flame or an electric light. On a cloudy day it is possible to get a sunburn even though you feel cool. Visible light and the kind of energy that produce warmth and sunburn are examples of electromagnetic energy.

2. The sun is 93 million miles from the earth. Yet we can use energy from the sun because electromagnetic energy travels through space.

3. Many other kinds of energy are also types of electromagnetic energy. Radio, television, and radar signals travel from transmitters to receivers as low-energy electromagnetic waves. Infrared (红外线的 ) radiation is an electromagnetic wave. When it is absorbed by matter, heat is produced. Waves of infrared and visible light have more energy than waves of radio, television, or radar. Ultraviolet rays (紫外线 ) and X-rays are electromagnetic waves with even greater amounts of energy. Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is useful in killing certain disease organisms. X-rays and gamma rays have so mush energy that they travel right through solid objects. They can be used to detect and treat cancer. X-rays are used in industry to find hidden cracks in metal, and in medicine to reveal broken bones.

4. Usually we use electricity to generate electromagnetic energy. The source of most of our energy is the sun. Heat from the sun causes water to evaporate. When the water falls to the earth as rain, some of it is trapped behind dams and then used to operate electric generators. Other generators are powered by coal, but the energy stored in coal came from the sun, too.

5. Until recently, the source of the tremendous amount of energy given off by the sun was a puzzle. If the sun depended on chemical reactions, it would have used up all its energy long ago. Experiments with electromagnetic radiation led to the theory that mass can be converted into energy. About forty years after the theory was proposed, nuclear energy was harnessed (利用 ) by man. Chemical energy comes from electron (电子 ) rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemical reactions, nuclear reactions release millions of times more energy per pound of fuel. We now believe that the sun&39;s energy comes from the nuclear reactions in which hydrogen is changed into helium (氦 ) .

6. Nuclear energy is beginning to compete with coal as an economical source of power to generate electricity. It is also being used to operate engines in large ships. Scientists continue to seek new and better methods of obtaining and using energy.

Paragraph 3__________ 查看材料

A.Nuclear reactions as the lasting source of the sun"s energy

B.The most important source of energy

C.Types of electromagnetic energy

D.The machines used for energy generation

E.Seeking new sources of energy

F.The use of ultraviolet radiation in medicine

D

There are three kinds of memory : sense memory , working memory, and long-term memory. Think of them as three connected rooms in which you store different kinds of memories. The flrst kind of memory is sense memory. Everything you are sensing right now is stored

here. Perhaps you feel the sun on your face or smell the aroma(香味) of food. Sense memories last only a few seconds, but they connect one moment to the next. They give your life a flow, even though they are quickly forgotten.

You keep a few items(条目 ) in working memory. These are memories you need for what you are doing. Suppose you look up a friend' s telephone number in the phone book..You ' ll probably remember the number for a little while. But if you get distracted(分神) , you might quickly forget it. A memory usually stays in your working memory for just a few days at most. Working memory has another limit, too. Only a small number of items fit into it at any given time.

Memories you want to keep for a long time go into your Iong-term memory. They can stay with you all your life. In long-term memory, you can store a huge number of items. Can you re- member how to play your favorite game？ Do you recall your first birthday party？ If so, you are bringing up memories that are stored in your long-term memory. Sometimes, people have trouble finding a particular long-term memory. Have you ever struggled to remember a familiar name or fact？ When this happens, people sometimes say the information is " on the tip of the tongue. "

68. Which of the following best describes the sense memory？

[A] It ' s your preference for certain food.

[B] It ' s something you did a while ago.

[C] It ' s a memory of the distant past.

[D] lt' s an immediate memory.

听力原文：M: Vicky! Have you heard the news？

W: No, Sam. What do you mean？

M: You know all the classes we've missed because of the snow？

W: Uh oh ....

M: Yup-we're going to have to make them up and the dean says it will have to be during spring break.

W: Sam! We have our-vacation all set! What are we going to do？ Do the others know？

M: I don't know but I certainly can't afford to miss five days of classes this semester, with that week I was sick ....

W: But I really don't want to cancel our trip. All of us have already made our plane reservations!

M: I can try to call the travel agency; maybe they can refund our money. But before we do anything we need to speak with our professors.

W: You think they'll excuse us from class？

M: Probably not. But I was talking to Mark this morning and he said that one of his professors told him that they could make up the class at a different time.

W: Wow--that's great! Which professor was it？

M: I don't know. But we're going to have to speak to all of them anyway.

W: Why didn't they add extra days at the end of the semester before summer classes？

M: Because of the graduation date, which can't be changed.

W: Are other colleges around here doing the same thing？

M: I would imagine set---it's been such a bad winter and we've missed too many classes. We do really need to make them up.

W: I know, I know. I was just really looking forward to this vacation. The idea of the sun and the beach!

M: Oh look, there's Professor Miller right now!

W: Come on, let's go talk to her!

(26)

A．They may not be able to take their vacation.

B．It may snow during their vacation.

C．They are going to need more money.

D．They may miss graduation.

A.I can draw a red sun

B.You can draw a red sun

All of the following are parts of the Sun's atmosphere EXCEPT the ______.

A．corona

B．chromospheres

C．photosphere

D．core

but _______________ quantities of radiation from the sun are

[A] soon

[B] well

[C] much

[D] possible