Whatisayawn(哈欠)andwhydopeopleyawn?Ayawnisoftenassociate...

问题详情：

What is a yawn(哈欠) and why do people yawn? A yawn is often associated with a person being tired. __1__ People yawn for many reasons including stress, boredom, emotion and overwork.

Have you noticed that yawning seems to be contagious(会传染的)? If one person yawns, this appears to cause another person to yawn. Researchers have found that 40－60% of people who see a picture of someone yawning will yawn themselves.__2__

Some people think that yawning is rude and suggests that you are bored or uninterested. Maybe a yawn is a signal to a group that it's time to go to sleep, or if someone yawns when they're bored, it may be a sign to change the topic of conversation. __3__ Animals of all types yawn. If you have a dog or cat, you've probably seen your pet yawn several times. Even some birds yawn such as cockatiel parrots, Adelie penguins and Emperor penguins.

Some of the scientific explanations of why we yawn claim it is caused by physical needs. One likely explanation is that the yawning reflex happens when our blood needs more oxygen. The deep breath helps supply the levels of oxygen in our blood. __4__ It is also thought that the same chemicals in our brain that affect our moods and emotions cause us to yawn.

Superstitions about yawning have been around for hundreds of years and can date back to the ancient Greeks. A common superstition says that a person must cover his or her mouth when yawning so that the soul does not escape through the mouth. __5__ Today most people do not believe these superstitions and know that a yawn is a physical reflex.

A. Did you yawn while reading this article?

B. Yawning is not limited to humans.

C. It will make you lose interest in your work.

D. But this is not always the cause for a yawn.

E. Even reading the word YAWN can make people yawn.

F. However, it doesn't mean that you need rest or relaxation.

G. Other people believe that yawning is a sign that danger is near.

1. ________　2. ________　3. ________　4. ________

5. ________

【回答】

DGACF

知识点：七选五题型

题型：信息匹配