单词：lentic ecosystem
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[00:02.55]第三单元 五大湖 [00:05.09]Lesson 9 1 Read and act [00:08.18]第九单元 读和表演 [00:11.26]Hey Kevin, where did you say you were born? [00:13.53]嗨,Kevin,你说你在哪里出生的? [00:15.80]I was born in Michigan, USA. [00:1
初中英语人教版初三
Exhibit Highlights Butterfly's Beauty, Diversity, Value to Ecosystem Flying Canvases They are gentle, colorful creatures that move with grace and flair. And in a warm and humid enclosure at the Smithsonians National Museum of Natural History in Washi
VOA标准英语2013年(三月)
This is Scientific Americans 60-second Science. Im Karen Hopkin, This will just take a minute. Have you ever said, I know it like the back of my hand? Well, how well do you know the back of your hand, or the back of your knee, or behind your ears? Pr
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By Margaret Besheer Irbil, Iraq 28 November 2006 Violence continued to grip the Iraqi capital Tuesday, with at least two car bombs exploding outside a hospital morgue, killing four people and injuring many more. The latest attacks come as Iraq's pre
2006年VOA标准英语（十一月)
Asian Carp now outnumber native fish in many areas of the United States and their expansion particularly threatens the fragile ecosystems of the Great Lakes. In an effort to control algae growth, catfish farmers in the southern United States introduc
VOA标准英语2010年(七)月
Kenya's ocean waters are home to five out of the world's eight species of turtles. All are classified as either endangered or critically endangered, and are threatened by poaching, fishing nets, development and pollution. The conservation groups Wata
VOA标准英语2010年(七)月