According to the passage, some engineers are trying to improve the handlebars because Paragraph 3 mainly discusses

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问题 According to the passage, some engineers are trying to improve the handlebars because
Paragraph 3 mainly discusses

选项 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.
D、how serious injuries occur.

答案D

解析 第三段的第一个句子是这一段的主题句,它指出了这一段的中心:受重伤的机理。第二、三、四个句子具体描述了这一机理。选项D与此相一致。
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