【解析】　细节理解题。从第一段第一句可知A项错误；由第一段第三句可知C项错误；由第一段第四句可知D项错误，故选B项，它是人们表达想法的一种方式。

　　【答案】　B

　　2．If you want to express the idea that "I am very friendly" to someone, you will ________.

　　A．raise your hand

　　B．put one hand onto the other

　　C．smile to the person

　　D．make a roof with your hands

　　【解析】　细节理解题。从第二段第二句"When you smile at someone，you are saying，'I want to be friendly'．.."可知C项正确。

　　【答案】　C

　　3．Which of the following is TRUE according to the passage?

　　A．Hand signs instead of finger signs are used every day.

　　B．There are schools, colleges and universities for the deaf in the USA.

　　C．The French priest Charles invented sign language.

　　D．Even babies are using sign language.

　　【解析】　细节理解题。从第四段及第六段可知"hand signs"和"finger signs"都在被使用；由第四段最后一句可知B项错误；从第四段"He invented a finger alphabet"可知C项错误；从第三段"Babies who can't talk can point at things.They are using sign language."可知D项正确。

　　【答案】　D

　　4．The passage is mainly about________.

　　A．an introduction to sign language

　　B．the importance of sign language

C．a famous priest in France