A.to discuss how abdominal injures in children occur.

　　B.To show that more than a third injuries were caused by bicycle accident

　　C.To point out what the countermeasures can be

　　D. To tell us why Kristy Arbogast began the project.

　　3. Paragraph 3 mainly discusses

　　A. why the children and their parents were interviewed

　　B. when the children turn the handlebars through 90 degrees

　　C. what causes the children to topple over(颠翻)

　　D. how serious injuries occur

　　3.D.分析：因为上段中提到了研究的目的是辨别受伤是怎样产生的，并想出一些应对措施，因此推断C和D可能是答案。而该段的第1句 概述了全段的大意：By interviewing the children and their parents, Arbogast and her team were able to reconstruct many of the accidents and identified a common mechanism responsible for serious injuries.而接下来的句子也是在具体说他们如何进行的实验They discovered thatTo maintain their balance they turn the handlebars through 90 degree--The bike then falls over and..

　　4. The passage implies that

　　A it is not easy to persuade manufacturers to adopt the new design

　　B. the team of engineers has not found any countermeasures

　　C. children like to ride bicycles at a very low speed

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