The idea is controversial（争议）, but about 20 percent of health conscious Australians are believed to eat the national 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 environmental studies.

　　53. 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

　　54. 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.

　　55. Some Australians begin to eat kangaroos because _____.

　　A. The kangaroos’ farts（放屁）contain no methane

　　B. The kangaroos have a special bacteria

　　C. The kangaroos are the national symbol in Australia

　　D. The kangaroos are low in fat and high in protein

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