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  3. Renewable energy, it turns out, does grow on trees. The fruit pods plucked from jatropha trees have seeds that produce clean-bur

Renewable energy, it turns out, does grow on trees. The fruit pods plucked from jatropha trees have seeds that produce clean-bur

admin2012-06-02  78
问题     Renewable energy, it turns out, does grow on trees. The fruit pods plucked from jatropha trees have seeds that produce clean-burning diesel fuel. But unlike corn and other biofuel sources, the jatropha doesn’t have to compete with food crops for arable land. Even in the worst of soils, it grows like weeds. Sound too good to be true? That’s why brothers Paul and Mark Dalton chose to name their Florida jatropha company My Dream Fuel.
    If President Barack Obama’s green-energy rhetoric is on the level, this should be the year the U. S. gets clued in to what much of the rest of the world is already betting: that jatropha, like other nonfood sources such as algae, will revive a biofuels movement battered of late by charges that it diverts too many crops from too many mouths. India has set aside 100 million acres for jatropha and expects the oil to account for 20% of its diesel consumption by 2011. Australia, China, Brazil and Kenya have also embraced it. In December, a Boeing 747 was successfully test-flown by Air New Zealand using a 50-50 blend of jatropha and aviation fuel.
    "This is a superior biodiesel, " says Roy Beckford, a University of Florida researcher and expert on sustainable farm development. He has been studying different varieties of jatropha and in February plans to publish his findings that trees like those the Daltons are growing (since 2006 they’ve planted 900,000 near Fort Myers) thrive so well in Florida that they may yield up to eight times as much oil as they do in places like India and Africa.
    Native to the Caribbean, jatropha curcas was taken to India in the 1600s by Portuguese sailors who used the seeds for long-burning lamp oil. When Paul Dalton, 54, a Washington attorney, decided to invest $ 500,000 in an alternative-fuel venture, he followed the Portuguese trail to India and found prolific new jatropha varieties being cloned in the city of Mysore. The fuel emits negligible greenhouse gases, and the trees can capture four tons of carbon dioxide per acre (which might make growers eligible for carbon credits on the global market). Says Ron Pernick, co-founder of the alternative-energy research firm Clean Edge, "Jatropha isn’t a silver bullet, but it looks very promising. "
    That’s good news not only for energy gluttons like the U. S. but also for energy-starved nations like Haiti, which rarely has enough diesel to power its capital for a full day. My Dream Fuel donates jatropha trees to Caribbean countries in the hope that they won’t have to choose between producing enough fuel and producing enough food. "We want to make money with jatropha, but we also want to make a difference, " Paul Dalton says. If jatropha can do both, it’s an idea that could grow like weeds.
We can learn from Para. 2 and 3 that
选项 A、Air New Zealand has put jatropha oil into practical use in its planes.
B、the former biofuels movement was accused of occupying cultivated land.
C、India has adopted jatropha oil as its main oil supplier.
D、jatropha in Florida may produce 8 times more oil than that in Africa.
答案B
解析 推理判断题。本题要求选择符合第二、三段内容的选项，所以需要逐个对选项进行甄别。[A]“新西兰航空公司已经将麻风树生产的柴油投入到其飞机的实际飞行中”，这与原文第二段最后一句话中的试飞成功相矛盾，所以[A]不正确；[B]“前一次的生物燃料运动被指控为占用耕地”，这可以综合第二段第一句话后半部分和第一段第三句的内容推导出，所以[B]正确。[C]“麻风树柴油已经成为印度主要的燃料来源”，这与原文第二段第二句话的内容不吻合，原文提到预计2011年才能达到20％。[D]“佛罗里达州麻风树的产油量比非洲的高8倍”，这与原文第三段最后一句话的内容不吻合，比原文多了一个more。
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