问题 选择题

植物性食物,如胡萝卜、番茄、黄玉米内均含有胡萝卜素,在人体内能转化为(  )

A.维生素C

B.维生素B

C.维生素D

D.维生素A

答案

维生素A能够促进人体正常发育,增强抵抗力,维持人的正常视觉,人体缺乏维生素A会患夜盲症;维生素A主要从动物肝脏、鱼肝油等食物中获得,植物性食物里虽然不含维生素A,但是在胡萝卜、黄色玉米等食物里含有大量的胡萝卜素,它在人体内能够转化为维生素A.

故选:D

阅读理解

阅读理解。

     New rules and behavior standards (行为规范) for middle school students came out (颁布) in March.

Middle schools are going to use a new way to decide who the top students are. The best students won't only

have high marks. The following are some of the new rules.

     Tell the truth. Have you ever cheated (作弊) in an exam? Don't do it again! That's not something honest

students should do.

     Do more at school. Good students love animals and care for other people. April is Bird Loving Month in

China. Is your school doing anything to celebrate it? You should join! In that way, you can learn more about

animals and how to protect them.

     Be open to new ideas. Have you ever thought people could live on the moon? Maybe you'll find another

earth in space in the future. Everyone's new ideas are important.

     Protect yourself. Has a thief ever taken money from one of your classmates? Don't let it happen to you.

If you have to go back home late, you should let your parents know.

     Use the Internet carefully. The Internet can be very useful for your study. But some things on the Internet

aren't for kids, so try to look at the good web pages. You can use the web pages for fun or homework.

1. When did the new rules and behavior standards for middle school students come out?

    _________________________________________________________________________.

2. What should the best students do in an exam? 

    _________________________________________________________________________.

3. What should you do if you have to go back home late?

    _________________________________________________________________________.

4. What can the children use the good web pages for? 

    _________________________________________________________________________.

5. What is the right attitude (态度) to new ideas?

    _________________________________________________________________________.

选择题