CROCODILES We can find crocodiles in tropical parts of the world, for example Africa, Sout - 试题答案网问答

第1题

Crocodiles（鳄鱼)lay their eggs and leave them under leaves or sand. Baby crocodiles have s

Crocodiles(鳄鱼)lay their eggs and leave them under leaves or sand. Baby crocodiles have special sharp teeth with which to break their way out of the shells. Crocodiles only live where it is hot. They are found in India, Australia, Africa and America. They spend most of their time lying around in the mud or the rivers. The crocodiles long powerful tail is used when the animal is swimming. It is also an excellent weapon, because it can be swung with great speed and force. One blow will knock down a man or even a big animal at once. The crocodile is very well protected against its enemies by the hard bony plates which cover most of its body, but because of the way its neck is formed, it cannot turn its head from side to side and so it can only see in front of itself. The crocodile has its teeth cleaned by the crocodile bird. For its food this bird takes the bits left in the crocodiles mouth. This helps the crocodile, which cannot clean its own teeth, for it cannot move its tongue up and down. With its rows of terrible pointed teeth it seizes its food, which may be a fish, an animal, or even a careless human being, and then holds it below the water until it is drown to death. The long-nosed crocodile is shy and timid and because of this, the people of West Africa where it lives, sometimes catch it for food. Many, many centuries ago there were crocodiles in England. We know this because we have found their bones buried far down in the earth on which London is built. But the Britain of today is too cold for them to live in. Crocodiles may grow to over thirty feet in length. When they lie floating in the water, they look like floating tree-trunks and it is often impossible to tell that they are there.

The female crocodile______.

A．buries her eggs

B．sits on her eggs

C．carries her eggs

D．eats her eggs

点击查看答案

第2题

This is a picture. It's a classroom（教室). It's a nice room. In the picture, we can see fi

This is a picture. It's a classroom(教室). It's a nice room. In the picture, we can see five desks and six chairs(椅子). You can see a girl and two boys, too.

Three books are on a desk. A pencil-box is on the desk, too. Two pens and two rulers are in the pencil-box.

The girl is Lucy. She is eleven. One boy is Mike. He's twelve. The other(另一个) boy is Jim. He is ten. They are in Class 2, Grade 1. They're good friends. Their teacher is Mr. Green. He isn't here.

What's in the picture？ ______.

A．a boy and a girl

B．a pen and two rulers

C．a classroom

点击查看答案

第3题

听力原文：W: Do you mind ff I turn the TV off？M: Can't you see the football match hasn't fi

听力原文：W: Do you mind ff I turn the TV off？

M: Can't you see the football match hasn't finished yet？

W: But the baby is already in bed.

M: Oh, all right. You always get your way.

What do we learn from the man's reply？

A．He doesn't care if it is turned off.

B．He thinks the woman is right.

C．He is reluctant to turn it off.

D．He wants the woman to watch the game, too.

点击查看答案

第4题

Witmer's research leads people to believe______.A．Tyrannosaurus Rex had lips and Tricerato

Witmer's research leads people to believe______.

A．Tyrannosaurus Rex had lips and Triceratops had cheeks

B．dinosaurs might have looked like mammals such as sheep

C．dinosaurs might not have looked like what we thought

D．dinosaurs must have looked like birds or crocodiles

点击查看答案

第5题

听力原文：W: Can you help me？ I seem to have lost my handbag.M: Calm down, Madam. I will fi

听力原文：W: Can you help me？ I seem to have lost my handbag.

M: Calm down, Madam. I will fill out this report for you. What color is it？

W: Well, it is a white one.

M: How big is it？

W: I guess it is about one foot long and seven inches tall.

M: What's in the bag, Madam？

W: There is a watch, two keys, and some money.

M: And where did you leave it.？

W: I am sure I left it in the restaurant.

M: Don't worry, Madam. I am sure we can find it. Now give me your name and telephone number.

What is the color of the woman's bag？

A．White.

B．Yellow.

C．Brown.

点击查看答案

第6题

The human brain contains 10 thousand million cells and each of these may have a thou sand

connections. Such enormous numbers used to discourage us and cause us to dismiss the possibility of making a machine with human-like ability, but now that we have grown used to moving, forward at such a pace we can be less sure. Quite soon, in only 10 or 20 years perhaps, we will be able to assemble a machine as completes as the human brain, and if we can we will. It may then take us a long time to render it intelligent by loading in the right software(软件)or by altering the architecture but that to will happen.

I think it certain that in decades, not centuries, machines of silicon (硅) will arise first to rival and then exceed their human ancestors. Once they exceed us they will be capable of their own design. In a real sense they will be able to reproduce themselves. Silicon will have ended carbon's long control. And we will no longer be able to claim ourselves to be the fi nest intelligence in the known universe. As the intelligence of robots increases to match that of humans and as their cost declines through economies of scale we may use them to expand our frontiers, first on earth through their ability to withstand environments, harmful to ourselves. Thus, deserts may bloom and the ocean beds be mined. Further ahead, by a combination of the great wealth this new age will bring and the technology it will provide, the construction of a vast, man-created world in space, home to thousands or millions of people, will be within over power.

In what way can we make a machine intelligent？

A．By making it work in such environments as deserts, oceans or space.

B．By working hard for 10 or 20 years.

C．By either properly programming it or changing its structure.

D．By reproducing it.

点击查看答案

第7题

Witmer's research leads people to believe ______.A．Tyrannosaurus Re had lips and Tricerato

Witmer's research leads people to believe ______.

A．Tyrannosaurus Re had lips and Triceratops had cheeks

B．dinosaurs might have looked like mammals such as sheep

C．dinosaurs might not have looked like what we thought

D．dinosaurs must have looked like birds or crocodiles

点击查看答案

第8题

听力原文：M: Right, I guess you've got some ideas for our product promotion（23).W: Well, fi

听力原文：M: Right, I guess you've got some ideas for our product promotion(23).

W: Well, first we must win over the medical circle, so I thought we should launch a campaign in all the specialist medical journals to promote our drugs, antibiotics and so on.

M: Yes, that's a good idea.

W: Then TV commercials.

M: Just a moment, are you sure we're allowed to advertise medicines on TV？

W: Oh yes, provided they are not drugs which need a prescription. You can advertise over- the-counter products. We can get users of our products to recommend them--"Their lotion cured my disease in six days." for example.

M: Now, hold on. It is forbidden to claim any positive cure for a disease. And we mustn't offer any drugs for illness which should be treated by a doctor.

W: Mmm. OK. What about this—a series of full page newspaper ads with the message that most doctors consider our products the best.

M: That depends on whether it's true.

W: Sure it is. But here is another suggestion. We could offer to return the purchase price to anyone who's not satisfied with one of our products (24). It's possible to do that, isn't it？

M: No, I'm afraid not (24). Manufacturers of medical products are not allowed to promise a return of price in their ads.

W: Well, it looks as though I'll have to come up with something else. I never realize the regulations were so rigid (25).

(20)

A．The advertising price of the products.

B．How to develop the quality of the drugs.

C．How to promote their products.

D．HOW to satisfy people with more medicine.

点击查看答案

第9题

？Read the article below about the central problem of Economics.？Choose the best word to fi

？Read the article below about the central problem of Economics.

？Choose the best word to fill each gap, from A, B, C or D.

？For each question 19—33,mark one letter (A, B, C or D) on your Answer Sheet.

？There is an example at the beginning.

The Central Problem of Economics

The central problem of economics is to satisfy the people's and nation's wants.

The problem we are faced with is that our resources, here identified as money, are limited. The only way we can resolve our problem is to make choices. After looking at our resources, we must examine our list of (19) and identify the things we need immediately, those we can postpone, and (20) we cannot afford. As individuals, we face the central problem involved in economics deciding just how to allocate (分配) our limited resources to provide (21) with the greatest satisfaction of our wants. Nations face the same problem. As a country's population grows the need for more goods and services grows correspondingly. Resources necessary to production may increase, but there (22) are enough re sources to satisfy the total desires of a nation. Whether the budget meeting is taking place in the family (23) room, in the conference room of the corporation (24) of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find methods of allocating limited resources in order to satisfy unlimited wants.

A short time ago economists (25) goods into two categories, free and economic. The former, like air and water, were in (26) abundance that economists had no concern for them. After all, economics is the (27) of scarcity (匮乏) and what to do about it. Today many of these "free goods" are (28) very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately (最终) (29) the producers' extra costs, and (30) taxpayers who pay for the government's involvement in cleaning the environment.

In the 1990s, almost all goods are (31) Only by effort and money can they be obtained in the form. people wish.

Meeting the needs of people and froming resources available (32) the basic activity of production. In trying to meet (33) wants from limited economic goods, production leads to new problems in economics.

(19)

A．want

B．problems

C．wants

D．resources

点击查看答案