2. 外语
  3. A. continually B. wasted C. at the top D. means E. causes F. everything G. put H. collecting I. vary J. appeal K. congre

A. continually B. wasted C. at the top D. means E. causes F. everything G. put H. collecting I. vary J. appeal K. congre

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问题     A. continually B. wasted C. at the top D. means E. causes
    F. everything G. put H. collecting I. vary J. appeal
    K. congregating L. efforts M. condemns N. achievement O. occasionally
    Around two billion people have no access to modern energy, and a billion have it only 【C1】______. The smoky stoves that many of them use, the World Health Organisation reckons, produce pollution that【C2】______ around 2 million premature deaths a year. Makeshift cookers also catch fire easily. And lives are not the only things【C3】______. Women and girls in rural villages lose time and energy walking around【C4】______ dirty solid fuels, ranging from crop waste to cow dung.
    The【C5】______ of a stove that produces more heat, more cleanly and with less fuel is clear.
    But Kirk Smith, a stove specialist at the University of California at Berkeley, points out that most 【C6】______ to promote cleaner stoves have failed. Too much emphasis has gone on technology and talking to people【C7】______, too little to consulting the women who actually do the cooking. When subsidies run out, the schemes have faltered, with stoves left unused or broken.
    Why might it be different this time? Wouter Deelder of Dalberg, a development consultancy, says that stoves have improved in【C8】______ from the materials used to the design of chimneys. Even so, the new stoves can cost $30 or more. Greater efficiency【C9】______ they pay for themselves in a few months, but the price is still prohibitive for people living on a few dollars a week. Moreover, technology that works well in the laboratory may fail in the field, where fuels, cooking practices and even the shapes of vessels【C10】______ widely.
【C1】
选项
答案O
解析 空格应填入副词，修饰have“使用”。由空格前的only“仅仅”一词可知，空格处含有“频率”的意味，词库中只有occasionally“偶尔”与only搭配句意通顺。continually“持续不断”与only矛盾，可排除。
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