动词转化成名词，表示人的名词常加er,有时加or,如：

　　survivor, creator, calculator investor, investigator, instructor, visitor, negotiator, inspector, educator, operator , communicator等；

　　前缀：unequal / inequality; improper; inappropriate; insufficient; dishonest(y); uncomfortable; discomfort; un(dis)satisfied; dissatisfaction等。

　　任务型阅读经典习题：

　　请认真阅读下列短文，并根据短文的内容要点完成文章后的表格。注意：补全填空应符合语法和搭配要求，每空只填一个单词。

　　A

　　When it comes to the world of computers, green computing is becoming one of the most popular trends. But, what is exactly green computing?

　　The term “green computing” is one that is being used in many different markets and areas all over the world in today’s global technology. Yet, many computer users out there aren’t sure what it means. Green computing is actually pretty easy to explain and to do---it is basically learning to use computer resources more efficiently to help the environment as well as making energy savings. The main goal of a green computing program is to reduce the use of energy and materials that harm the environment. Green computing helps to promote the use of biodegradable products and recycle computer parts whenever possible．

　　Green computing started as early as 1992, when the EPA created Energy Star, which is a voluntary labeling program that promotes energy-efficient computing equipment and technologies．

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