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

答案 1.  阅读课文并回答问题。

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

We laugh because it helps us make and maintain social connections, it helps us understand situations are non-threatening, and because it can make us more popular.

2. How is laughing unlike speaking?

Laughter is produced in a different way physically: by forcing air out quickly, without using the teeth or lips. The sounds made are similar to those we make when highly emotional, not to words. Laughing is similar to animal noises – and uses a different part of the brain to speech.

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