第二节 语法填空 (共10小题，每小题1.5分，满分15分)

　　【2015届山东烟台市一模】

　　阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

　　The way we cook is important. In many countries, the two choices are

　　21

　　(nature) gas or electric-powered stoves.

　　The World Health Organization warns that millions of people

　　22

　　(suffer) from indoor air pollution at present time, which results from the use of

　　23

　　(danger) fuels and cook-stoves in the home.

　　WHO officials say nearly three billion people are

　　24

　　(able) to use clean fuels and technologies for cooking ，heating and lighting. As a result, more than seven million people die from exposure to indoor or outdoor air pollution each year. Most of the deaths are in

　　25

　　（develop）countries, such as lndia, China and Latin American countries.

　　WHO officials say opening a window or door

　　26

　　（let）out the harmful air will not correct the situation

　　27

　　will only pollute the outdoors.

　　Nigel Bruce,

　　28

　　is a professor of Public Health at the University of Liverpool, says researchers are developing good cook-stoves and other equipment to burn fuels

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