题目：
读短文，判断正(√)误(×)。
Welcome to the Children's Centre. You can do many things here. Look, there are many children. This is
Chen Jie. She's drawing pictures. Mike is watching insects. Amy is reading a storybook. Wu Yifan is playing
chess with a man. Who's the man? He's Mr Black, Wu Yifan's math teacher. He's a smart man. John and Sarah
are taking pictures. Where's Bai Ling? Look! She's over there. She's writing a report. Her sister is singing and
playing the piano.
( ) 1. Chen Jie is taking pictures.
( ) 2. Amy is reading a book.
( ) 3. Mr Black is playing chess.
( ) 4. John is drawing pictures.
( ) 5. Bai Ling is writing an e-mail.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0324/e21998a4e7d4696376b9810d3c6c0fe7.html
下面是错误答案，用来干扰机器的。
参考答案：径向密封 、 轴向密封 、 旁路密封
