阅读下面短文，用适当的词填空。

　　Trees are useful to human beings in three important ways：they 　　1　　 them with food and other produces; they give them 　　2　　; and they help to 　　3　　 floods．　　4　　 in many parts of the world, people haven't realized that the 　　5　　 of these services is the most important．To get quick profits from the tree, they have cut them in 　　6　　 numbers, only to find that they have 　　7　　 their good friends．Two thousand years ago a rich and 　　8　　 country cut down its trees to build warships, with which it seized an empire．It gained the empire, 　　9　　, without its trees, its 　　10　　 became hard and poor．When the empire fell to pieces, the home country found itself faced with floods and starvation．

　　It is difficult for the government to 　　11　　 the villagers to see this．They are usually too lazy or too careless to plant and look after new trees．　　12　　 the government has a good system of control, the forest will slowly 　　13　　．This does not only mean that the villagers' sons and grandsons will have fewer trees．The results are even more 　　14　　．Where there are trees, their roots break the soil up－allowing rain to sink in．The roots also bind the soil, 　　15　　 preventing it from being washed away easily．If there are no trees, rain falls on hard ground and flows away from the surface, carrying away with it, the rich top-soil．When all the top-soil is gone, nothing 　　16　　 but a worthless desert．

1．________　2．________　3．________　4．________　5．________

6．________　7．________　8．________　9．________　10．________

11．________　12．________　13．________　14．________　15．________

16．________

任务型阅读

　　Without most people realizing it, there has been a revolution(革命)in office work over the last ten years．Before that time, large computers were only used by large, rich companies that could afford the investment．With the advancement of technology, small computers have come onto the market, which are able to do the work that used to be done by much larger and expensive computers, so now most smaller companies can use them．

　　The main development in small computers has been in the field of word processors(文字处理软件), or WPS as they are often called．40％ of British offices are now estimated to have a word processor and this percentage is growing fast．

　　There are many advantages in using a word processor for both secretary and manager．The secretary is freed from a lot of daily work, such as re-typing letters and storing papers．He or she can use this time to do other more interesting work for the boss．From a manager’s point of view, secretarial time is being made better use of and money can be saved by doing daily jobs automatically outside office hours．

　　But is it all good?If a lot of daily secretarial work can be done automatically, surely this will mean that fewer secretaries will be needed．Another worry is the increasing medical problems related to work with visual display units(显示器)．The case of a slow loss of sight among people using word processors seems to have risen greatly．It is also feared that if a woman works at a VDU for long hours, the unborn child in her body might be killed．Safety screens to put over a VDU have been invented but few companies in England bother to buy them．

　　Whatever the arguments for and against word processor, they are a key feature(特征)of this revolution in office practice．