Why do we laugh_ 为什么我们会笑？

当我们听到有趣的笑话时定会忍俊不禁。然而，这并不是最常见的“发笑因素”，最能引人开怀大笑的究竟是什么呢？答案其实很简单：与人共处。研究显示，和他人在一起时发笑的频率是独处时的三十倍，而且人类并不是唯一能被逗乐的物种。

测验与练习

1. 阅读课文并回答问题。

1. Why do we laugh so much when we're with others?

2. How is laughing unlike speaking?

3. If I tell a bad joke does it make you split your sides or groan?

4. How do you make a rat laugh?

5. True or false? The part of the brain responsible for speaking is newer than the part used for laughing.

2. 请你在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处 。

1. I can't stop _________ whenever Tim talks. He's just so funny.

rib-tickling splitting giggling groaning

2. He _________ his claim with photographic evidence.

back upped back up heightened backed up

3. After running for 10 miles I was _________ heavily.

wheezing snorting chortling tickling

4. Don't you dare say that again or you'll be laughing on the other side _________.

of my face of your face of our face of the face

5. Police were sent in to deal with a _________ situation.

threatened non-verbal non-threatening threatening