2017届高考英语二轮专题复习精品之
阅读理解
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.
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.
【2017届高考英语二轮专题复习 阅读理解部分之限时训练(十九)】相关文章:
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (58)
★ 2014届高考英语一轮复习课时作业(二)必修1Module 2《My New Teachers》(外研版)
★ 2014届高考英语一轮复习课时作业(二十三)必修4Module 5《A Trip Along the Three Gorges》(外研版)
★ 2017届高考英语二轮复习大题冲关秘籍语法填空:命题分析(含解析)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (22)
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练:2(含解析)
★ 浙江省湖州市2014高考英语阅读理解一轮(暑假)精炼(10)含答案
★ 四川省2016届高考英语一轮复习课时作业(26) Module 2 A Job Worth Doing 外研版必修5
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (20)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (53)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21