We sometimes call the lion “the king of the forest” , because it is stronger and more dangerous than other animals. It can ______ faster than many animals and hunt the best. It is the highest animal in the ______ food chain.

In the sea, the shark is one of the animals at the top of the food chain. It can swim faster than ______ other sea animals, and it can use its big teeth to eat them.

What is at the top of the world's food chain?People are!We are not the biggest or fastest, but we are the ______.We could not run faster than cheetahs (猎豹), so we ______ cars and now we can move the fastest. We could not fight better than lions, so we invented guns. Now we can hunt the best.

People's inventions are clever, but they can be ______,too. For example, people built ______,and now they make the air and rivers dirty. This can make terrible changes. Dirty rivers kill fish.______ bears cannot eat the fish. If we kill one part of the food chain, other parts will also die. Remember that we are a part of the food chain, ______ we are in danger, too!If we protect animals, we are protecting ______!We could and we should do something for the world!

1.A. walk B. swim C. run D. jump

2.A. sea B. land C. mountain D. desert

3.A. most B. another C. any D. more

4.A. strongest B. cleverest C. most special D. most important

5.A. used B. had C. invented D. made

6.A. interesting B. dangerous C. careful D. helpful

7.A. factories B. hotels C. schools D. hospitals

8.A. If B. When C. While D. Then

9.A. and B. so C. but D. or

10.A. ourselves B. oneself C. yourselves D. themselves

Dolphins (海豚) are not fish but mammals (哺乳动物).They live in groups, and speak to each other in their own language. In this way they are like many other animals, like bees. But dolphins are very different from almost all land animals. Their brain (脑) is nearly the same size as humans', so they are the cleverest animals. And they live for 20 to 30 years.

But what does the dolphin look like?The dolphin has teeth, and eats fish. It can grow up to three and a half metres long. Its nose is very long. Like some other animals, the dolphin uses sound to find its way. They make sound to talk to each other and to help find food. We now know they don't use their ears to listen to the sound, but the jaws (颚).

Dolphins are friendly to people. They often save people in the sea. So many people like them.

1.What kind of animals are dolphins?

A. Fish. B. Mammals. C. Birds. D. We don't know.

2.The biggest difference between dolphins and other land animals is that ______.

A. their brain is nearly the same size as humans' B. they live in groups

C. they speak to each other in their own language D. they are mammals

3.The dolphin can grow up to ______ metres long.

A. 3.5 B. 2.5 C. 3 D. 2

4.Dolphins listen to the sound through their ______.

A. ears B. mouths C. jaws D. heads

5.Which of the following sentences is WRONG?

A. Dolphins can live for 20 to 30 years.

B. Dolphins often use sound to find their way.

C. Dolphins aren't friendly and they like to attack (袭击) people.

D. Dolphins can help people who are in trouble in the sea.

Not only adults but also teenagers have problems in their life. Here is a survey showing the main problems of teenagers.

They feel stressed because they have too much homework to do both at school and at home. They have lots of exams to take. And parents usually send them to different classes at weekends. They don’t have their own time to do what they are interested in.

Now more and more teenagers are getting short-sighted. They often read in bed or keep reading for a long time without having a rest. Some of them are crazy about playing computer games. Some spend too much time watching TV.

Another serious problem among teenagers is that many of them are becoming fat. They eat too much junk food, but they take little exercise.

I think teenagers should think of ways to deal with problems. They should make a plan for study and hobbies. In this way, they can relax themselves.

1.How many main problems are mentioned in the survey?

A. One. B. Two. C. Three. D. Four.

2.Teengaers feel stressed because they have .

A. too much homework B. lots of exams

C. different classes to take at weekends D. A,B and C

3.The underline word“short-sighted”means in Chinese.

A. 目关短浅的 B. 近视的 C. 无先见的 D. 小眼的

4. make(s) teenagers become fat.

A. Eating too much junk food B. Taking too little exercise

C. A and B D. Reading for a long time without rest

5.Teenagers can relax themselves by .

A. making a plan for study and hobbies B. watching TV too much

C. reading in bed D. playing computer games

阅读短文,并按要求完成下列句子。

We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another place 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 is probably the migration of the fish which is called “salmon” (鲑鱼).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. 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 the 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 place, but at other times we don't. Maybe living things just like to travel.

1.The reason for most of the animals to move is ____________.

2.Find the word in the passage which means “the movement from one place to another of a large group of animals” and write it down here: ______.

3.The underlined word “There” in the second paragraph refers to (指的是) ____________.

4.The salmon comes back to its birthplace in order to ____________.

5.The lobsters begin to move to another place when ____________.

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