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W: I’m thinking of take five courses next semester.M: Wouldn’t four be wiser What does the man mean about the courses（）

A. Five may be too many.
B. The decision must be made soon.
C. It would be smart to take more.
D. Four People are enrolled in them.

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A．sideB．ideaC．fiveD．lid

There are some steps you can take to avoid catching a cold. Contrary to popular belief, colds are not caused by exposure to severe weather. Colds are caused by viruses in the body, and you are better off out on the ski slopes or even waiting for the bus on a snowy day than you are in a cozy room, surrounded by friends, or fellow students, who just may be sick. A chill is an early sign of illness. It’s the cold that caused the chill, not the other way around.While the virus can spread through droplets (微滴) propelled into the air when a cold sufferer coughs or sneezes (打喷嚏), surprisingly, this is not the most common route of transmission. Numerous studies have now shown that the majority of colds are caught by hand contact.Cold viruses also can be transferred to objects -- telephones, towels, plates -- and remain infectious for up to three hours. Frequently hand-washing on the part of the cold-sufferer as well as other members of the family will minimize the spread of viruses in this way.ColdsSource of colds: (46) Common signs of colds: 1. (47) 2. (48) ;3. sneezeMost common transmission route: (49) Precautions to take: (50) 47（）

[听力原文]11-15The dog has been man’s best friend for thousands of years. Dogs are friendly and faithful animals. Many stories are told of the bravery and faithfulness of dogs. A dog named Barry saved 40 persons when they were lost in the snow on the Saint Bernard Pass in Switzerland about 150 years ago.Dogs are also intelligent animals, so it is easy to train them.Dogs are also helpful in scientific research. The world’s first space-traveller was a dog named Laika. Russian scientists sent it up in a man-made Earth satellite in 1957. Dogs have been film stars, too. A dog called Lassie was the star in a number of American films.Dogs can hear and smell better than men, but they cannot see so well. You may be surprised to learn that dogs are colour-blind. A dog lives on average for about 12 years. A dog aged six months compares in age with a child six years old. A thirteen-year-old child is not yet grown up, but a thirteen-year-old dog is a very old dog indeed. What fact may surprise you about dogsDogs are（）

[听力原文]M: I don’t think you can build your model in less than a week.W: Mary made hers in three days. What does the woman say about Mary（）

A. She built a model a week ago.
B. She completed her model quickly.
C. She made her model in more than a week.
D. She failed to make her model.