题目

A. stop B. start C. else D. habit When people are working or studying, some of them cannot focus (集中思想). It’s very easy to get lost in the technology around them, such as cell phones and iPads. How can you break the bad【1】? “Forest,” a mobile phone app (应用程序), is here to help people stay focused. When you want to get some work done, you plant a seed (种子) in the app. Then it will grow when you put down the phone and 【2】 working. If you work for 30 minutes, it will grow into a colorful and healthy tree. However, if you leave the app to play a game or do somethin垂直于同一个平面的两条直线平行．    （填写对号或错号）．