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46、 You can improve your health by __.
A． bringing physical activity into your timetable
B． eating less and less during short periods of time
C． relaxing and keeping cool
D． D, getting as many activities as you can

47、 People say that __
A． they do not have time for physical activity
B． they do not know the suitable physical activity
C． getting into physical activity is not so difficult
D． getting into physical activity is the most difficult part

48、根据以下资料，回答48-67题。 　　The winter in Iceland has been one of the worst ever．An animal that was born in Iceland and just returned there has enjoyed the weather．Keiko is a killer whale who is now living in a hidden bay.
　　When Keiko was one or two years old, he was captured．This was in 1979．In 1982 he was moved to an amusement part in Ontario, Canada．Three years later another park took him to Mexico City．There, the 6.4-meter (21-foot) whale lived in a small pen with water that was too warm．In1993 the "Free Willy" movie made people aware of his state．In 1996 the Free Willy Keiko Foundation moved him to a pool in an aquarium in Newport, Oregon.
　　The foundation has spent over $12 million to return Keiko to Iceland, his home．Late last year the 40,000-pound (18,100-kilogram) whale was flown on a C-17 transport plane to pen near the Wesman Islands.
　　Critics thought Keiko would suffer in the cold water．Instead, he is enjoying the cold and becomes more active．He likes to jump out of the water to get sprayed by the salt spray．Since his return, he acts more like a wild whale．He dives more often, eats more live fish, and is more active.
Keiko still isn't ready to go out alone into the open sea．Trainers hope to put him in a larger bay．They also hope to train him to follow a boat．They don't know what Keiko will do when he meets other sea animals．So far the only animals who have come near Keiko's cage left when they saw him.
　　They would like to let Keiko free this summer．No one knows if he will be ready．If he isn't, the Keiko Foundation is ready to take care of him．It will cost about $1 million a year. Critics thought that Keiko would __.
A． die from the cold water in Iceland
B． be happy to return home
C． want to be free
D． be less active

49、 Keiko has __.
A． enjoyed being with other sea animals
B． killed other sea animals that have come into his pen
C． had limited contact with other sea animals
D． is ready to go to the open sea

50、 This summer trainers hope to __.
A． give Keiko a freedom in the wild
B． immediately set him free
C． move him to another aquarium
D． still keep him in the cage

51、 IfKeiko can't adjust to the wild, the foundation __.
A． will set him free anyway
B． will bring him back to the United States
C． will take care of him for the rest of his life
D． won't be able to take care of him

52、根据以下资料，回答52-71题。 　　Many people catch a cold in the springtime and/or fall．It makes us wonder., if scientists can send a man to the moon, why can't they find a cure for the common cold．The answer is easy．There are literally hundreds of kinds of cold viruses out there．You never know which one you will get, so there isn't a cure for each one.
　　When a virus attacks your body, your body works hard to get rid of it．Blood rushes to your nose and brings congestion with it．You feel terrible because you can't breathe well, but your body is actually "eating" the virus．Your temperature rises and you get a fever, but the heat of your body is killing the virus．You also have a runny nose to stop the virus from getting to your cells．You may feel miserable, but actually your wonderful body is doing everything it can to kill the cold.
　　Different people have different remedies for colds．In the United States and some other countries, for example, people might eat chicken soup to feel better．Some people take hot baths and drink warm liquids．Other people take medicines to stop the fever, congestion, and runny nose．
There is one interesting thing to note--some scientists say taking medicines when you have a cold is actually bad for you．The virus stays in you longer because your body doesn't have a way to fight it and kill it．Bodies can do an amazing job on their own．There is a joke, however, on taking medicine when you have a cold．It goes like this:
　　If takes about one week to get over a cold if you don't take medicine, but only seven days to get over a cold if you take medicine.
The reason that scientists cannot cure a common cold is __.
A． we don't know how we get cold
B． we aren't sure the exact kind of cold viruses
C． we don't know when we will catch cold
D． we aren't sure the exact scientific method

53、 When we catch cold, how does our body work hard?
A． Our runny nose stops our breat
B． Our temperature rises to make us feel miserabl
C． Our blood rushes into our cell
D． Our nose, fever, and blood work together to kill viru

54、 Scientists say when we catch cold, __.
A． taking medicine
B． seeing a doctor
C． leaving it to your body
D． making a joke to your friend

55、 The joke means taking medicine __.
A． is better than not taking it
B． needs longer time to recover
C． is the same with no medicine
D． has no effect