题目内容：
.
第三部分：阅读理解（共15小题，每题2分，满分30分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
Australian scientists are trying to give kangaroo-style stomachs to cattle and sheep in a bid
to cut the emission of greenhouse gases blamed for global warming.
Thanks to special bacteria in their stomachs, kangaroo farts co
ntain no methane（甲烷）and scientists want to transfer that bacteria to cattle and sheep who emit large quantities of the harmful gas.
While the usual image of greenhouse gas pollution is a billowing smokestack pushing out carbon dioxide, livestock passing wind co
ntribute a surprisingly high percentage of total emissions in some countries.
"Fourteen percent of emissions from all sources in Australia is from enteric methane from cattle and sheep," said Athol Klieve, a senior research scientist with the Queensland state government.
"And if you look at another country such as New Zealand, which has got a much higher agricultural ba
se, they're actually up around 50 percent," he said.
Researchers say the bacteria also makes the digestive process much more efficient and could potentially save millions of dollars in feed costs for farmers.
But it will take researchers at least three years to isolate the bacteria, before they can even start to develop a way of transferring it to cattle and sheep.
Another group of scientists, meanwhile, has suggested Australians should farm fewer cattle and sheep and just eat more kangaroos.
The idea is controversial（争议）, but a
bout 20 percent of health co
nscious Australians are believed to eat the natio
nal symbol already.
"It's low in fat, it's got high protein levels and it's very clean in the sense that basically it's the ultimate free range animal（散养动物）," said Peter Ampt of the University of New South Wales's institute of enviro
nmental studies.
56. According to the passage, global warming is now mainly caused by _____ .
A. methane B. carbon dioxide C. livestock passing wind D. not mention in this passage
57. What does the underlined phrase “the idea”（paragraph 9）refer to?
A. Australians should give kangaroo-style stomachs to cattle and sheep.
B. The bacteria could make the digestive process much more efficient.
C. Australians should farm fewer cattle and sheep and just eat more kangaroos.
D. The bacteria could potentially save millions of dollars in feed costs for farmers.
58. How will Australian scientists solve the problem of global warming?
A. Eating more kangaroos.
B. Killing more cattle and sheep.
C. Letting cattle and sheep pass less wind.
D. Transferring the special bacteria in kangaroos’ stomachs to cattle and sheep.
最佳答案：
56---58 DCA
答案解析：
略
考点核心：
人物传记类文章的文体特征：
人物传记是记叙文体的一种，主要描写某人的生平事迹、趣闻轶事、生活背景、个性特征、成长奋斗历程等，包含记叙文的时间、地点、人物、事件等要素。其特点是以时间的先后或事件的发展为主线，空间或逻辑线索贯穿文章始终，脉络清楚，可读性较强。
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