问题 填空题

催化裂化反应是(),热裂化是()。

答案

参考答案:正碳离子反应机理;自由基反应机理

阅读理解

Just a Quick Nap 只要打个盹儿

Do you feel a little sleepy after lunch? Well, that’s normal. Your body naturally slows down then. What should you do about it? Don’t reach for a coffee! Instead, take a nap.

It’s good to have a daily nap. First of all , you are more efficient(有效的) after napping . You remember things better and make fewer mistakes. Also, you can learn things more easily after taking a nap. A nap may increase your self-confidence(自信) and make you more active . It may even cheer you up. But, there are some simple rules you should follow about taking a nap. First, take a nap in the middle of day, about eight hours after you wake up. Next, a 20-minute nap is best. If you sleep longer, you may fall into a deep sleep. After waking from a deep sleep, you will feel worse. Also, you should set an alarm clock. That way, you can fully relax during your nap. You won’t have to keep looking at the clock so you don’t oversleep.

Now,the next time you feel sleepy after lunch , don’t get stressed . Put your head down, close your eyes, and catch forty winks.

小题1:It is       to get sleepy for you at noon.

A. normal          B. strange         C. amazing

小题2:After taking a nap, you may feel more        .

A. stressed         B. confident        C. sleepy

小题3:The proper period(一段时间)of time for taking a nap is      .

A. as long as you like       B. eight hours     C. about twenty minutes

小题4:What can help you have a fully relaxing nap according to the passage?

A. A cup of coffee.         B. A quick meal.   C. An alarm clock.

小题5:What is the text mainly about?

A. Why and how to take a nap.

B. Rules to increase your self –confidence.

C. How to make your body slow down.

单项选择题 共用题干题