题目

下列做法错误的是（） A . 用熟石灰改良酸性土壤 B . 用喷漆的方法防止自行车支架生锈 C . 用炭黑制墨汁 D . 用汽油溶解油污形成溶液的方法除去餐具上的油污 答案：D　　No one knows how man learned to make words. Perhaps he began by making sounds like those made by animals. Perhaps he grunted (发出呼噜声) like a pig when he lifted something heavy. Perhaps he made sounds like those he heard all round him－water splashing (飞溅), bees humming (嗡嗡作响声), 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 fifteen 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 bigger. Read as many books as you can. There are plenty of books written in easy English for you to read. You will enjoy them. When you meet a new word, find it in your dictionary. Your dictionary is your most useful book. 1．What do we mean by language? [　　] A．Sounds made by man. B．All the words made by man. C．Different kinds of sounds. D．The way man learns. 2．From the passage we know that long long ago ________. [　　] A．no one learned how to make sounds or words B．animals taught man to learn the language C．man learned the language by lifting heavy things, falling to the ground, and so on D．man followed a lot of things in nature to make sounds and words 3．What is the number of languages spoken in the world today? [　　] A．500.B．5,000. C．1,500.D．15,000. 4．In which sentence can the word“contain(s)”be put so that it is a right one? [　　] A．I ________ several dictionaries. B．Sea water ________ salt. C．A dog ________ four legs. D．Mr. Smith ________ glasses on his nose. 5．Which of the following is the best if we want to make our vocabulary larger? [　　] A．To use the words in everyday life. B．To read more books. C．To read easy books. D．To look up new words in the dictionary.