问题 单项选择题

梯形图如下图,该梯形图显示的心律失常为()。

A.2型题

B.窦性期前收缩

C.房性期前收缩

D.交界性期前收缩

E.室性期前收缩

答案

参考答案:E

解析:梯形图显示第5个心搏激动(黑圆点)起源于V行,且提前出现,上传心房过程中遇到窦性激动下传而被阻滞在房室结,其前后的心搏间距规则,代偿间歇完全,此图用来解释室性期前收缩。

阅读理解

阅读理解。

     It's only $79.99! How many times have you heard those words on TV or read them in a newspaper ad?

The word "only" is supposed to make you think that this is a great price for the product.

     But think about this how long does it take you to earn $79. 99? What do you have to do to get that money?

The little thing that's only $79.99 is worth almost 12 hours of your work! And if you are making less than this,

how long will it take to earn that much money?

     So as you stand in a store, telling yourself that you have to buy something, think about how long you must

work to earn the money to pay for it. Is that $85 T-shirt really worth the time to earn $85? You could probably

find a similar shirt at another store for under $35, right?

     Even if your parents are still buying your clothes, someone has to work for the money. If you spend money

on one thing, you don't have money to spend on anything else. So if you spend $85 on those jeans, you cannot

put it in the bank, and you cannot go snowboarding (单板滑雪) or to the movies with friends because you don't

have the money to go.

1. Saying that "It's only $79.99" may make you think that it _____.

A. is expensive

B. is important

C. is cheap

D. can't be accepted 

2. Which is NOT mentioned in the passage?

A. The newspaper ad may use some words to promote sales (促销).

B. The $79.99 T-shirt doesn't have good quality.

C. The T-shirt may make you spend the money you planned to use for some other things.

D. You car find a similar T-shirt at another store for a lower price.

3. From the passage we know that _____.

A. the T-shirt isn't worth buying

B. the T-shirt is too expensive

C. We shouldn't believe the newspaper ad

D. before we buy something, we should think about what it is really worth

5. We can probably find the passage in a(n) _____.

A. advertisement

B. Youth Newspaper

C. Year-book

D. story-book

单项选择题