大学英语四级新题模拟训练及参考答案_大学英语阅读

　　How bones help the body move.

　　How bones continuously repair themselves.

　　The chemical composition of human bones.

　　20. They defend the bone against viruses.

　　They prevent oxygen from entering the bone.

　　They break down bone tissue.

　　They connect the bone to muscle tissue.

　　21. They have difficulty identifying these cells.

　　They arent sure how these cells work.

　　Theyve learned how to reproduce these cells.

　　Theyve found similar cells in other species.

　　22. To learn how to prevent a bone disease.

　　To understand differences between bone tissue and other tissue.

　　To find out how specialized bone cells have evolved.

　　To create artificial bone tissue.

　　Conversation 2

　　23. A new fuel for buses.

　　The causes of air pollution.

　　A way to improve fuel efficiency in buses.

　　Careers in environmental engineering.

　　24. Her car is being repaired.

　　She wants to help reduce pollution.

　　Parking is difficult in the city.

　　The cost of fuel has increased.

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