单词：fossilica
单词：fossilica 相关文章
Plant Self-defense Plants may appear to be helpless in the face of hungry,toothy animals but many plants have evolved interesting systems of self-defense. Coarse meadow grasses are a good example. If you run your finger along a blade of coarse grass,
英语听力文摘 English Digest
AMERICAN MOSAIC -July 12, 2002: Balloonist Steve Fossett / Songs by Rosemary Clooney / Question About Actor Bruce Lee HOST: Welcome to AMERICAN MOSAIC — VOA’s radio magazine in Special English. (T
American Mosaic
AS IT IS 2015-07-14 Silica Sand Mining Worries Communities 美国硅砂矿引发社区担忧 The United States is increasing production of oil and natural gas through a process known as fracking. This process is sometimes called hydraulic fracking be
2015年VOA慢速英语(七)月
SCOTT SIMON, HOST: Fifty years ago today, a lanky college student from Oregon won the high jump at the 1968 Mexico City Olympics and revolutionized his sport. NPR's Tom Goldman tells us the story of the Fosbury Flop. TOM GOLDMAN, BYLINE: For a man wh
2018年NPR美国国家公共电台10月
AILSA CHANG, HOST: Despite mounting evidence and a stream of dire warnings, federal regulators and mining companies failed to protect coal miners from toxic dust. MARY LOUISE KELLY, HOST: NPR and the PBS series Frontline spent more than a year lookin
2018年NPR美国国家公共电台12月