涨知识！打哈欠会“传染”，也是无法被阻止的！

                                                                                                   

Why do we yawn? A new study researched this. It found that yawning is unstoppable. We yawn when we see others yawn. We yawn more when we try to stop yawning. Some people want to yawn more than other people. Reading about yawning could make us yawn. You might want to yawn right now.
The researchers studied the actions and brain activity of thirty-six people. They looked at videos of other people yawning. They then had to yawn or stop themselves yawning. The people were videoed doing this. Jackson said understanding more about yawning will help to treat illnesses. He wants to find ways to help the brain.

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1.We yawn______.

A when we eat

B when we go out

C when we wear yellow hats

D when we see others yawn

解析：选D。细节理解题。根据第一段中We yawn when we see others yawn.可知，当我们看到别人打哈欠时，我们就会打哈欠，故选D。

2.People yawn more when ____.

A they go to bed

B they are swimming

C they try to work harder

D they try to stop yawning

解析：选D。细节理解题。根据第一段中We yawn more when we try to stop yawning.可知当我们试图停止打哈欠时，我们打哈欠会更频繁，故选D。

3.Why will the readers want to yawn right now?

A Because reading is so interesting.

B Because reading makes people yawn.

C Because sleeping could make us yawn.

D Because reading about yawning could make us yawn.

解析：选D。细节理解题。根据第一段最后两句 Reading about yawning could make us yawn. You might want to yawn right now.可知当读者读到关于打哈欠的文章时，也会想打哈欠，故选D。

4.How many people did the researchers study?

A 36.

B 40.

C 46.

D 66.

解析：选A。细节理解题。根据第二段第一句The researchers studied the actions and brain activity of thirty-six people.可知，研究人员研究了36个人的行为和大脑活动，故选A。

5.What does Jackson want to do?

A He wants to yawn.

B He wants to go to bed.

C He wants to have a rest.

D He wants to find ways to help the brain.

解析：选D。细节理解题。根据第二段最后一句He wants to find ways to help the brain.可知他想找到帮助大脑的方法，故选D。