题目内容：
Riding bicycles can save energy.
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
选择题：Riding bicycles can save energy.
- 题目分类： 大学英语B级
- 题目类型：选择题
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Please call me back when you are free.
Please call me back when you are free.
People use science knowledge to understand and change nature.
People use science knowledge to understand and change nature.
Our library is as big as theirs.
Our library is as big as theirs.
The earthquake in Sichuan made Chinese people unite as one.
The earthquake in Sichuan made Chinese people unite as one.
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