Many kinds of animals are believed to have _________ from the earth.

（） . Another type of eustress leads to better performance, but only up to a point, as the illustration displays. 题目: According to most researchers, how many kinds of stress are there？

A．One B．Two C．Three D．Four

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Many Americans are happy with this kind of marriage. But some other Americans have a different impression of marriage and family responsibilities.

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We know that many animals de not stay in one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded.

When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration (迁移) is probably the migration of fish, which is called "salmon". This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea. Recently, scientists have studied the migration of a kind of lobster (龙虾). Every year, when the season of bad weather arrives, the lobsters get into a long line and start to walk across, the floor of the ocean. Nobody knows why they do this, and nobody knows where they go. So, sometimes we know why humans and animals move from one place to another, but at other times we don't. Maybe living things just like to travel. Most animals move from one place to another at a certain time to ______. A．give birth B．enjoy warmer weather C．find food more easily D．find beautiful places

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By saying that many kinds of fiction are self-explanatory （the first sentence of paragraph

By saying that many kinds of fiction are self-explanatory (the first sentence of paragraph 2), the author means ______. A．they are easy to understand B．they are meant for ordinary readers C．they often use horror to develop their plots D．their categories show what they are about

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Plastic bags are useful' for holding many kinds of food, ______ their cleanness, toughness and low cost.

A．by virtue of B．in addition to C．for the sake of D．as opposed to

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where are the animals of Asia？

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The author's experiments with different kinds of animals seem to prove that ______.

A．man and other animals have some similarities B．man is the cruelest among animals C．man is superior to other animals in some aspects D．man is inferior to other animals in certain aspects 此题为多项选择题。

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21. Now many animals can do some simple jobs that are done by human beings.

22. The writer says that 8t a circus we can see animals doing cIever tricks. 23. The trainer usually gives the animal a piece of candy or fruit after it has done the trick. 24. The reward in the passage means "attention paid to a good behavior". 25. Many animals may be trained to do simple jobs if they know who their trainers are. 26. Geese can be used to guard a house. 27. When the pigeon sees a ball which looks different from the others , it makes a noise. 28. Trainer usually spends 40 days or so training a pigeon to inspect sm811 steel balls. 29. An ape is a large monkey. 30. Scientists believe apes may drive buses one day.

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Sometimes give up is also a kind of love,because there are always so many helpless in the world.

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Social change is more likely to occur in societies where there is a mixture of different kinds of people than in societies where people are similar in many ways. The simple reason for this is that the

A、Social change tends to meet with more difficulty in basic and emotional aspects of society. B、Disagreement with and argument about conditions tend to slow down social change. C、Social change is more likely to occur in the material aspect of society. D、Social change is less likely to occur in what people learned when they were young.

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Many pet cats are in danger from ____ from other animals

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请阅读Passage 1。完成第小题。Passage 1Social change is more likely to occur in societies where there is a mixture of different kinds of people than in societies where people are similar in many ways. The simple

A、joint interest B、different points of view C、less emotional people D、advanced technology

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Vitamins are a group of substances found in food. The body needs them for life and health. So (1), many people are concerned (2) the question: Am I getting enough vitamins, and am I getting the (3) kind？

Even though very small (4) of each vitamin are enough for the (5) of the body, the worry people have about vitamins has some basis. And this has to do (6) their diet---the food they take in. A person eating a good (7) of foods get all the vitamins now (8) to be needed. The problem is that there are many people (9) don’t choose foods wisely. So the answer (10) this question is: No (11) vitamins are needed, (12) you eat proper foods. In fact, many of the vitamins cannot be (13) in the body, so when extra vitamins are taken in, the body simply gets rid of them. It is even (14) to put too much of certain vitamins into the body. This has been found to be true (15) vitamin A and D, when large amounts are taken (16). What foods supply what vitamins？ Here is a quick (17) idea. Vitamin A for the (18) of the eyes, skin, teeth, and bones, is found in green vegetables, fruits, eggs, liver and butter. Vitamin B1 which (19) the nervous and digestive (20) and prevents certain diseases, is found in cereals, pork and liver. VitaminB2 is found in milk, eggs, green vegetables and meats. Vitamin C, which helps bones and teeth, is found in tomatoes, certain fruits and vegetables. These are only a few of the most important vitamins the body needs. 1. A.normally B.naturally C.predictably D.likely 2. A.of B.in C.with D.at 3. A.particular B.exact C.special D.right 4. A.needs B.qualities C.volumes D.amounts 5. A.needs B.standards C.hunger D.wish 6. A.to B.with C.of D.about 7. A.variety B.kind C.sort D.range 8. A.clear B.known C.acquainted D.understood 9. A.they B.which C.whose D.who 10. A.at B.to C.of D.about 11. A.rich B.exceptional C.extra D.plenty 12 A.when B.providing C.where D.that 13. A.saved B.digested C.stored D.assembled 14. A.harmless B.beneficial C.harmful D.fatal 15. A.to B.of C.in D.at 16. A.down B.up C.in D.at 17. A.specific B.detailed C.general D.vague 18. A.sake B.health C.favor D.interest 19. A.forms B.harms C.changes D.helps 20. A.part B.system C.collection D.combination

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Many kinds of animals are believed to have _________ from the earth.

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