51.The underlined words “shared a word” in Paragraph 7 probably mean A. exchanged ideas with each other B. discussed the meaning of a word C. gained life experience D. used the same language
52. According to Nancy, the degree of success of the project is judged by A. the careful selection of a proper book B. the growing popularity of the writers C. the number of people who benefit from reading. D. the number of books that each person reads.
D
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 contain 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 contribute 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 base, they're actually up around 50 percent," he said.
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