问题 填空题

去年发生在齐齐哈尔市的假药案已致使多人死亡.经查实,该假药中含有损害人体肾脏的成分“二甘醇”(化学式为C4H1003),“二甘醇”在人体内可发生如下反应:C4Hl003+402=2X+3H20,而导致人中毒.

请填空:

(1)一个“二甘醇”分子中共有______个原子.(2)x的化学式为______.

(3)“二甘醇”中各种元素的质量比为______.

答案

(1)根据标在元素符号右下角的数字表示一个分子中所含原子的个数,由此可知一个“二甘醇”分子中共有17个原子;

故答案为:17;

(2)根据质量守恒定律,反应前后元素的种类不变,原子数量不变,可推测出x的化学式为:C2H204;故答案为:C2H204

(3)根据化合物中各元素质量比=各元素的相对原子质量×原子个数之比,由此可知C4H1003中各种元素的质量比为:

(12×4):(1×10):(16×3)=48:10:48=24:5:24,故答案为:24:5:24.

阅读理解

阅读理解。

     Microblog is a kind of multimedia blog (多媒体博客) that allows users to send messages, articles,

 photos and videos on the Internet. The information can be read by anyone or by someone that is chosen

  by the user.

     Microblog is different from a traditional blog. It is smaller in size. Like any other Internet tool,

 Microblog can be used for a number of purposes (目的).

     Microblog is a tool for communicating with your friends. We can make what happened to us known

  to our friends, anywhere and at any time, for example, "I watched the film Confucius today. It is really

  nice. "Then your friends can have a short discussion on your topic. They can also post similar events in

  their lives to share with you.

     Microblog can also offer you the chance to get closer to movie stars or sport stars. Stars can write

 what they see, hear, or think through Microblog. Fans can learn more about their favourite stars' daily

 activities immediately.

     Students can also use Microblog as a social service to see what their classmates are doing. Everyone

  finds it useful, not only students. For example, when preparing for performances, organizers can use

 Microblog to contact performers and quickly.

1. People can't send _____ online by Microblog according to the first paragraph.

    A. videos

    B. photos

    C. articles

    D. emails

2. Which of the following about Microblog is TRUE?

    A. It is smaller than a traditional blog.

    B. Only your friends can see the information on your Microblog.

    C. Every star has their own Microblog.

    D. Microblog is popular with everyone.

3. What dose the underlined word"contact"mean in Chinese?

    A. 表扬

    B. 联系

    C. 招聘

    D. 排练

4. Which of the following is the writer's opinion on Microblog?

    A. It is harmful to children.

    B. It has many advantages.

    C. Using it is very expensive.

    D. People only use it for fun.

5. What is the passage mainly about?

    A. An introduction to Microblog.

    B. How to use Microblog.

    C. The bad effects of Microblog.

    D. Who likes to use Microblog.

单项选择题