【答案】

       16. Yes, they can    

　　17. By email, QQ and we Chat.    

　　18. The code is easy to keep and share/The teacher can check the homework anywhere at any time.    

　　19. They worry/are afraid their children will spend too much time on computers and less time communicating with teachers.    

　　20. (開放式回答)It is interesting /useful /helpfut.

　　【解析】試題分析：本文以郭老師允許學生通過QR碼交作業(yè)的實例，說明新的家庭作業(yè)方式的優(yōu)點：代碼容易保存和共享，教師可以隨時隨地查看學生作業(yè)。同時，解答了家長們的擔心。

　　16. 題意：根據(jù)文章，郭的學生可以在微信上做作業(yè)，不是嗎？考查文意理解題。根據(jù)短文內容和When students finish the homework，they keep it on WeChat，可知說法正確，故填Yes, they can。

　　17. 題意：QR碼怎么寄給郭先生？考查細節(jié)理解題。根據(jù)The QR codes can be sent to Mr. Guo by email, QQ and WeChat.，可知填By email, QQ and we Chat.。

　　19. 題意：有些家長擔心什么？考查細節(jié)理解題。根據(jù)They are afraid that their children will spend too much time on computers and less time communicating with teachers.，可知填They worry/are afraid their children will spend too much time on computers and less time communicating with teachers.。

　　20. 題意：你認為新的提交家庭作業(yè)方法怎么樣？考查綜合理解題。根據(jù)短文內容，結合學生的普遍看法Guo’s students like the new way and think it is interesting.，可知填It is interesting/useful /helpful.。

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