下列化合物中，不能通过单质间化合直接制取的是（　　）

    WeChat is a part of our daily life. We can chat with friends, share our photos on Moments and kill time by reading WeChat public accounts. And now, we can even gain new knowledge in WeChat study groups. Some teachers assign (布置) homework on WeChat groups or through other learning software. Song Xueying, a 16-year-old girl from Zhejiang province thinks that online homework makes our life more convenient because students are able to hand in their homework any time and anywhere. Hao Xiangjie, Song's classmate argues that online homework can do harm to students. This is because they are too young to get rid of the temptation (诱惑) of the Internet.

【写作内容】

1）用约30个单词写出上文概要；

2）用约120个单词阐述你对"利用微信群布置和完成作业"这一做法的看法，并用2 ~3个理由或论据支撑你的看法。

【写作要求】

1）写作过程中不能直接引用原文语句；

2）作文中不能出现真实姓名和学校名称；

3）不必写标题。

直接写出得数．

7.62﹣5=      0.25×4=      0.6× $\frac{1}{6}$ =    0.3²=                 7.6÷4=

9.6÷10%=    0.2×（ $\frac{1}{2}$ ﹣0.5）=          $\frac{3}{4}$ ÷0.75=          41×101=     1÷3× $\frac{1}{3}$ =

央视推出第二季《中国诗词大会》，入选的诗词涵盖豪放、田园、咏物等各个类别，聚焦忠孝、仁义、爱国等中华优秀传统文化主题。推出这一节目有利于（    ）

①学会抵制外来文化        ②中华文化成为世界上最优秀的文化

③丰富人的精神世界        ④传承中华优秀文化，增强文化认同感