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 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（）," 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.

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