单选题 One language is used in every country. People, young and old, short and tall, thin and fat, use it very often. It's everybody's second language. It is easy to understand. It is the sign language.
When you wave your hand in the street, you are saying "Hello" to your friend. When you put up your hand in class, you're telling the teacher that you know the fight answer or that you want to ask your teacher a question. When a policeman wants to stop cars or buses, he raises his hand. He is using sign language.
Sign language is more useful in quiet places. For example, when you are swimming with your friends, you can have a talk under water by using sign language.

单选题 English is used in every country.

【正确答案】 B

【答案解析】[详细解答] 根据本文第一小段可知手语在任何国家通用，并非英语。

单选题 The body language uses signs mainly.

单选题 Your friend knows where to go when you wave your hand to him in the street.

【正确答案】 B

【答案解析】[详细解答] 从第二段第一句话可以得出，在大街上向朋友挥手是向朋友打招呼的意思。

单选题 A policeman stop a car by blowing his whistle.

【正确答案】 B

【答案解析】[详细解答] 从第二段第三句话可以得出，警察想让车停下来是举手示意，而非吹口哨。