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It's been protected from human impact since 1909. With three million acres, nearly a half million under water, Superior National Forest is largely unspoiled. But now the survival of this national treasure rest with those who would see some of it bur
国家地理2008年
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
Robert Burns(17591796) O my luve is like a red, red rose, That's newly sprung in June; O my luve is like the melodie That's sweetly played in tune. As fair thou art, my bonie lass, So deep in luve am I; And I will luve thee still, my dear, Till a' t
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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
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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
听歌学英语:Edleweiss 音乐之声插曲 edleweiss 雪绒花（小提琴版）这样一首温馨的歌曲同样出自于美国电影《音乐之声》。它也是我对小学时音乐课最美好的回忆。 [00:02.50]EnglishExpress [00:05.95]轻松
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