A.Fish. B.Mammals. C.Birds. D.We don't know.
37.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
38.The dolphin can grow up to ______ metres long.
A.3.5 B.2.5 C.3 D.2
39.Dolphins listen to the sound through their ______.
A.ears B.mouths C.jaws D.heads
40.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.
B
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 ta ke.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 shortsighted.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 and find time to relax as much as possible.
41.How many main problems are mentioned in the survey?
A.One. B.Two. C.Three. D.Four.
42.Teenagers 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
43.The underlined word “shortsighted” means “______” in Chinese.
A.目光短浅的 B.近视的 C.无先见的 D.小眼的
44.______ make(s) teenagers become fat.
A.Eating too much junk food B.Taking little exercise
C.A and B D.Reading for a long time without having a rest
45.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
C
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, s cientists 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.
46.The reason for most of the animals to move is ____________.
47.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: ______.
48.The underlined word “There” in the second paragraph refers to (指的是) ____________.
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