Unit 3 A taste of English humour Using language课时作业

Ⅰ.完形填空

　　All our food comes directly or indirectly from soil. The soil which is dark in colour is humus (腐质土). Humus includes plenty of useful materials __1__ from dead plants and waste __2__ from animals. Soil __3__ its food. If we do not __4__ it with any, __5__ will not grow well on it. Animal __6__ is the best food for soil, and chemical __7__ are good, too. A change of crop every year in the same soil will also do __8__.

　　When soil is too __9__， winds blow it away, and the land will soon look like a __10__. Farmers can prevent this __11__ growing trees. This will weaken the __12__ of the wind. After a heavy rain, the __13__ carries the humus down to the river. This often happens __14__ the fields are on the hillsides. Farmers can level their fields and make them __15__.

　　At the beginning of the __16__ there have been about 7,000 __17__ people on earth. We now ought to __18__ every bit of the soil. __19__， where will such a large __20__ grow their food?

　　语篇解读：本文是一篇说明文。怎样才能让我们赖以生存的土壤更好地为我们服务呢？又怎样才能减少土壤的流失呢？本文将给出答案。

　　1．A.died　　　　　　　　　　　 B．made

　　C．brought D．taken

　　解析：选D　taken from "从......中取出；取材于"是过去分词短语作定语，修饰useful materials。

　　2．A.matter B．gases

　　C．goods D．rubbish

　　解析：选A　waste matter"废弃物"，这里指"(动物的)粪便"。　

　　3．A.eats B．needs

　　C．feeds D．enjoys

　　解析：选B　土壤"需要"食物，指上文中的dead plants和waste matter from animals。

　　4．A.give B．produce

　　C．supply D．develop

　　解析：选C　supply ...with ..."把......提供给......"。

　　5．A.man B．trees

　　C．plants D．animals

解析：选C　直接依靠土壤而生存的只有植物，而B项太片面。