16、阅读下文，回答16-30题

　　No one knows how man learned to make words. Perhaps he began by making sounds like those made by animals. Perhaps he grunted like a pig when he lifted something heavy. (78)Per-haps he made sounds like those he heard all round him--water splashing, bees humming, a stone falling to the ground. Somehow he learned to make words. As the centuries went by, he made more and more new words. This is what we mean by language.

　　People living in different countries made different kinds of words. Today there are about fif-teen hundred different languages in the world. Each contains many thousands of words. A very large English dictionary, for example, contains four or five hundred thousand words. But we do not need all these. Only a few thousand words are used in everyday life.

　　The words you know are called your vocabulary. You should try to make your vocabulary big-ger. Read as many books as you can. There are plenty of books written in easy English for you toread. You will enjoy them. When you meet a new word, find it in your dictionary. Your dictiona-ry is your most useful book.

　　16、From this passage, we know that__________.

　　A.man never made sounds

　　B.man made animal sounds

　　C.man used to be like animals to make sounds

　　D.man learned from the animals to make sounds

　　17、The number of different languages spoken is about__________.

　　A.150

　　B.1,500

　　C.5,000

　　D.4,000

　　18、People from different countries__________.

　　A.made same words

　　B.made different kinds of words

　　C.had a same language

　　D.used some sounds

　　19、Man__________ to make sounds.

　　A.used words

　　B.followed many things in nature

　　C.lifted heavy things

　　D.grunted like a pig

　　20、You can enlarge your vocabulary by__________.

　　A.reading more books

　　B.finding new words in dictionaries

　　C.writing more

　　D.using the words in everyday life

　　21、阅读下文，回答21-35题

　　(76) Concerning money or anything else, conflicts between husband and wife usually reflect a power straggle. Conflicts between parent and child often center around the same issue. As children enter adolescence, they begin to demand greater freedom to go where they please, do what they please, and make decisions without parental interference. Many American parents do not know how to deal with their teenagers and seek advice from books, lectures, and parent training courses. Par-ents want to maintain a friendly relationship with their teenagers and also want to guide them so that their behavior will be whatever the parents consider proper and constructive.

　　But in a society of rapidly changing social and moral values, parents and children often disagree about what is important and what is fight.

　　(77) Arguments may concern such unimportant matters as styles of dress or hairdos. But quar-rels may also concern school work, after school jobs, decisions, use of the family car, dating, and sex behavior. Some families have serious problems with teenagers who drop out of school, run away from home, or use illegal drugs. Because so much publicity is given to the problem teenager,one gets the impression that all teenagers are troublemakers. Actually, relatively few adolescents do anything wrong, and nearly all grow up into "solid citizens" who fulfill most of their parents'ex-pectations. In fact, recent studies show that the "generation gap" is narrowing. The vast majority of teenagers share most of their parents'values and ideas. Many parents feel that they get along with their adolescents quite well.

　　21、According to the writer, conflicts between husband and wife usually reflect__________.

　　A.feeling of hatred

　　B.power struggle

　　C.that they don't care for each other

　　D.that they may appeal to divorce

　　22、As children enter adolescents, they begin to do the following EXCEPT__________.

　　A.demanding greater freedom to go wherever they please

　　B.making decisions without parental interference

　　C.getting married whenever they please

　　D.doing what they please

　　23、"... generation gap is narrowing. "means__________.

　　A.the adolescents now become timid

　　B.parents come to get along with their children

　　C.the vast majority of teenagers share most of their parents'values and ideas

　　D.parents and teenager don't like to quarrel

　　24、Parents and children often disagree about what is important or right because__________.

　　A.they have different styles of life

　　B.they hate each other

　　C.parents think that their children are troublemakers

　　D.they are in a society of rapidly changing social and moral values

　　25、When many American parents don't know how to deal with their children they seek advice from the following EXCEPT__________.

　　A.neighbors

　　B.parent-training courses

　　C.books

　　D.lectures