跨平台移动开发框架优点有哪些？
A. 一次编写，多平台运行，自动适配各种屏幕尺寸
B. 上手迅速，开发效率高
C. 避过麻烦的重重审批，直接面向用户
D. 没有美工基础的开发人员也可以设计出优秀的界面
1.While he was watching TV,he heard a knock at the door.
2.If the town is seen from the top of the hill,it looks more beautiful .
3. As the watch is used for a long time ,it needs repairing .
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