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D. wild animals, fresh wild vegetables and fruits
45．From this article, we know that ．are not good to our health
A．protein and vitamin C
B．milk and grain foods
C．wild animals, vegetables and fruits
D．a huge amount of fatty, salty and sweet foods
B
This year some twenty-three hundred teen-agers(young people aged from13-19)from all over the world will spend about ten months in U. S. homes. They will attend U. S. schools, meet U. S. teen-agers, and form impressions of the real America. At the same time, about thirteen hundred American teen-agers will go to other countries to learn new languages and gain a new understanding of the rest of the world.
Here is a two-way student exchange(交换)in action. Fred, nineteen, spent last year in Germany with George's family. In turn, George's son Mike spent a year in Fred's home in America.
Fred, a lively young man, knew little German when he arrived, but after two months' study, the language began to come to him. School was completely different from what he had expected-much harder. Students rose respectfully when the teacher entered the room. They took fourteen subjects instead of the six that are usual in the United States. There were almost no outside activities(活动).
Family life, too, was different. The father's word was law, and all activities were around the family rather than the individual(个人). Fred found the food too simple at first. Also, he missed having a car. "Back home, you pick up some friends in a car and go out and have a good time. In Germany, you walk, but you soon learn to like it."
At the same time, in America, Mike, a friendly German boy, was also forming his idea. "I suppose I should criticize(批评)American schools", he says. "It is far too easy by our level. But I have to say that I like it very much. In Germany we do nothing but study. Here we take part in many outside activities. I think that maybe your schools are better in training for citizens(公民). There ought to be some middle ground between the two. "
46. This year _____ teen-agers will take part in the exchange programme between America and other countries.
A. twenty three hundred B. thirteen hundred
C. over three thousand D. less than two thousand
47. The whole exchange programme is mainly to _____ .
A. help teen-agers in other countries know the real America.
B. send students in America to travel in Germany
C. let students learn something about other countries
D. have teen-agers learn new languages
48. Fred and Mike agreed that _____ .
A. American food tasted better than German food
B. German schools were harder than American schools
C. Americans and Germans were both friendly
D. There were more cars on the streets in America
49. What is particular in American schools is that _____ .
A. there is some middle ground between the two teaching buildings
B. there are a lot of after-school activities
C. students usually take fourteen subjects in all
D. students go outside to enjoy themselves in a car
50. After experiencing the American school life, Mike thought _____ .
A. a better education should include something good from both America and Germany
B. German schools trained students to be better citizens
C. American schools were not as good as German schools
D. the easy life in the American school was more helpful to students
C
It was Thursday, September 12, 1940. Four French teens were out exploring in the woods off the northern slopes of the Pyrenees. Many years before, an old pine tree fell and left a large hole in the ground. The teenagers were curious and they started to explore the area and fell into one of the most important archeological（考古的） finds of the twentieth century!
There are over a hundred limestone（灰岩）caves in this region of France. Some were inhabited by humans thousands and thousands of years ago. Between 15,000-17,000 years ago, humans painted lively creatures such as cows, bulls, horses, and even cats on the walls of the cave.
Why did they mark these walls? Was it to tell a story? Was it to record a famous battle? There are many mysteries and ancient secrets still waiting to be discovered in the cave of Lascaux. There were dots in many of the paintings. What do these dots mean? Were they meant to record time, a calendar? Deep in the cave, there is a drawing of a "birdman’’. What does this mean? Was it a place for sacred ceremonies? No one knows for sure.
The actual cave of Lascaux was closed in 1963 due to the over-abundance of tourists visiting the site. The carbon dioxide that people were breathing out was causing damage to the fragile(易损的) cave paintings. Up till now the Lascaux cave is still closed for tourists. Only a specialist can visit the cave by a special order that must be made out almost a year in advance. Not more than six persons can enter the cave per day. Two days a week, the cave is completely closed. Due to the great interest of numerous tourists, in 1983 Lascaux II was opened for tourism. It is an exact replica of the cave of Lascaux,
51. The Pyrenees are the in France.
A. mountains B. forests C. rivers D. caves
52. What does the underlined word inhabited mean?
A. built B. explored C. lived in D. destroyed
53. In the author's opinion, the cave paintings are .
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