2.Can dolphins(海豚) talk?Maybe they can't talk with words,but they talk with sounds.They show their feelings with sounds.Dolphins travel in a group.We call a group of fish a school.Dolphins are mammals(哺乳動物),not fish,but they swim together in a school.They talk to each other in a school.They talk when they play or when they are happy or sad or afraid.They say"welcome"when a dolphin comes back to the school.Dolphins make a few sounds above water.They make many more sounds under water.People can't hear these sounds because they are very,very high.Scientists make tapes of the sounds and study them.Sometimes people catch dolphins for a large aquarium(水族館).But dolphins don't like to be away from their school at an aquarium.They are sad and lonely.There are many stories about dolphins.They help people.Sometimes they save somebody's life.Many people believe that dolphins bring good luck to humans.
51.Dolphins talk withD. A.words B.music C.their hands D.sounds 52.The underlined word"school"here meansB. A.學校 B.群 C.洋流 D.線條 53.Dolphins make the most soundsC. A.a(chǎn)bove water B.for tapes C.under water D.in an aquarium 54.Dolphins like to beC. A.a(chǎn)t an aquarium B.a(chǎn)lone C.in their school D.on a tape 55.You can most probably find the passageA. A.in a science book B.in a news report C.in a novel D.in a fashion(時尚) book.
2.A cold is a common illness(疾。甀t often starts with a sore throat.And you usually have a headache,too.It's not serious,but you can feel very bad. What should you do when you have a cold?You should have a good rest first.It's good to drink a lot of water,too. You can see a doctor and take some medicine.Maybe you can also try some Chinese medicine that is now very popular around the world. What should you do to keep from catching a cold?One important way is to exercise more often.Running,swimming or even walking can help a lot.Try to exercise for at least 30minutes a day.It's also important to go to bed and get up early.Studies show that the cold or flu virus(流感病毒) can live on our hands for a long time.So you should wash your hands with soap.Finally,it's important to have a balanced diet(均衡飲食). If you can do these,you will hardly ever catch a cold again. 46.What is a cold like?D A.It's scary. B.It often needs a lot of treatments. C.It's very serious. D.It brings some problems. 47.What should you do when you have a cold?A A.Go to a doctor. B.Sleep early and get up late. C.Exercise more often. D.Drink much cold water. 48.How many ways are mentioned(被提到) to keep from catching a cold?B A.Three. B.Four. C.Five. D.Six. 49.Why should you often wash your hands with soap?A A.Because it may help keep the flu virus away. B.Because it makes our hands nicer. C.Because it is not expensive for us to buy soap. D.Because it makes our hands smell good. 50.What can we know from the passage?D A.Only Chinese medicine can help stop a cold. B.We should run or swim when we have a cold. C.The most important way to stop a cold is to drink lots of water. D.Good eating habits and much exercise can help us stay away from a cold.