Question：
Many people prefer to read books in electronic format on a computer screen or other devices. Others prefer to read paper books. Which way do you prefer?

答题思路：
观点：电子书
原因一：轻便便携
展开：可以在手机上阅读，上千本书随身携带
原因二：更容易
展开：内建字典，遇到生词点击查看释义

重点语言：
1. portable and lightweight 便携、轻便
2. storage 存储量
3. carry something on the go 随身携带
4. built-in 内建
5. tap and hold 点击并按住
6. pop up 弹出
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