试题与答案

阅读理解。 Summer holidays are coming soon. A

题型:阅读理解

题目:

阅读理解。
     Summer holidays are coming soon. Are you going to travel? If you plan to take a plane, you will have a
healthy trip by following these suggestions (建议).

1. Bring some needed medicines in your carry-on bag.
2. Don't leave your seat during the plane's take offs and landings.
3. To prevent blood clots (血流不畅):
★ 1______
★ Do leg-stretching (伸) exercises in your seat.
★ Wear comfortable clothes.
4. If you sometimes get airsick:
★ 2______ 
★ Keep your seat belt fastened (系好安全带).
★ Don't take small planes.
5. 3______  Don't take wine or alcohol (酒).
6. Use both hands when reaching overhead for something. 4______ 
A. This will help prevent yourself from getting hurt.
B. Better drink water or juice when you feel thirsty.
C. Get up and walk around every 60 to 90 minutes.
D. Ask for a window seat or a seat over the wing.
5. What's the best title for the passage?
A. A Plan for Summer Holidays.
B. Suggestions for an Interesting Trip.
C. Suggestions for a Healthy Air Trip.
D. Problems during an Air Trip.

答案:

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参考答案:A解析:[分析]: 本题考查的是关系规范化方面的基本概念。若关系模式R的每一个分量是不可再分的数据项,则关系模式R属于第一范式(1NF);若关系模式属于1NF,且每一个非主属性完全依赖于码,则关系模式...

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