问题 填空题

船闸是利用______原理建造的.在西藏边防哨所一般就要使用高压锅做饭,因为高压锅能够在锅内形成高的气压,使锅内水的______ 升高,所以能够煮熟饭且较快.

答案

(1)三峡船闸是世界上最大的船闸,它的建造是利用了连通器的原理制成的;

(2)大气压随高度的增加而减小,在高原地区,由于海拔高度较高,所以那里的气压低,水的沸点降低,所以饭不容易煮熟;高原地区人们一般都使用高压锅,因为高压锅能够在锅内形成较高的气压,水的沸点会随气压的增大而升高,所以能够将饭煮熟.

故答案为:连通器;沸点.

单项选择题
阅读理解

阅读理解。

                                                  If You Make a Mistake, Don't Worry!

     Yeah, you may want to forget about them, but mistakes can be useful. Making a mistake doesn't mean it's

the end of the world. In your real life you have to grow and mature, and you will experience some growing

pains.

     You know you should have studied hard but you went out with some friends instead. You know you should

have put the money into the bank for a rainy day instead of spending it on all kinds of things you didn't need.

     Most people experience growing pains and make mistakes when they are growing up. If you make mistakes,

face them and learn from them. All of the famous people you wish to copy have made mistakes. They'll

continue to make mistakes for all their successes.

     One of the major differences between people like them and the majority of others is that they don't let their

mistakes stop them. Instead, they use their mistakes as learning tools.

     At the very least, when you make a mistake, you'll know what not to do. And you can help others by

warning them of the mistakes you've made. Don't let mistakes stop you from doing anything. Learn from them,

and don't hide. Face up to your mistakes now and later you will mature.

     What mistakes are you making now? Take a look at anything you might be doing wrong. Take a step back

and evaluate (评估) your situation, and then correct your mistakes. Then move forward.

     Always remember your mistakes to remind yourself of what not to do for the future.

1. Why does the writer say mistakes can be useful? [ ]

A. Because you can get to the end of the world.

B. Because famous people also make mistakes.

C. Because you can mature by facing and learning from mistakes.

D. Because you spend money on something you don't need.

2. When you make mistakes next time, what should you do? [ ]

A. Try to face the mistakes.

B. Let mistakes stop you from doing anything.

C. Forget the mistakes you make.

D. Expect others to make the same mistakes.

3. What can you learn from the passage? [ ]

A. Before you make any mistake, you had better hide in your room.

B. Remember your mistake and don't make the same mistake again.

C. Don't go out with some of your friends any more.

D. Forget your mistakes.