2. 外语
  3. Around two billion people have no access to modern energy, and a billion have it only(1)_____. The(2)_____ stoves that many of t

Around two billion people have no access to modern energy, and a billion have it only(1)_____. The(2)_____ stoves that many of t

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问题     Around two billion people have no access to modern energy, and a billion have it only(1)_____. The(2)_____ stoves that many of them use, the World Health Organisation(3)_____, produce pollution that(4)_____ around 2 million premature deaths a year. Makeshift cookers(5)_____ catch fire easily. And lives are not the only things(6)_____. Women and girls in rural villages lose time and energy walking around(7)_____ dirty solid fuels, ranging from crop waste to cow dung.
    The(8)_____ of a stove that produces more heat, more cleanly and with less fuel is clear.(9)_____ Kirk Smith, a stove specialist at the University of California at Berkeley, points out that most(10)_____ to promote cleaner stoves have failed. Too much emphasis has(11)_____ on technology and talking to people(12)_____, too little to (13)_____ the women who actually do the cooking. When subsidies(14)______, 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(15)_____ from the materials used to the design of chimneys. Even so, the new stoves can cost $30 or more. Greater efficiency(16)_____ they pay for themselves in a few months, but the price is still prohibitive for people living(17)_____ a few dollars a week.(18)_____, technology that works well in the laboratory may fail in the field,(19)_____ fuels, cooking practices and even the shapes of vessels(20)_____ widely.
(1)
选项 A、continually
B、favorably
C、optionally
D、occasionally
答案D
解析 由空格前的only“仅仅”一词可知，空格处含有“频率”的意味，四个选项中只有occasionally“偶尔”与only搭配句意通顺。continually“持续不断”；favorably“赞同地”；optionally“可选择地”。
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