Care for Our Mother Earth (Dr. McKinley of Awareness Magazine interviews a group of experts on environmental issues.) Dr. McKinley: What do you think is the biggest threat to the environment today? Am

发表于:2018-12-04 / 阅读(24) / 评论(0) 分类 大学体验英语综合教程

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

发表于:2018-12-24 / 阅读(45) / 评论(0) 分类 Scientific American(五)月

By Zulima Palacio Kauai, Hawaii 18 June 2007 The Hawaiian archipelago represents the most isolated group of islands in the world. Plants and animals that are common to many people elsewhere only made it to these islands in the last few hundred years

发表于:2019-01-11 / 阅读(73) / 评论(0) 分类 2007年VOA标准英语(六月)

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

发表于:2019-01-13 / 阅读(55) / 评论(0) 分类 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

发表于:2019-01-13 / 阅读(56) / 评论(0) 分类 VOA标准英语2010年(七)月

Camels are not usually associated with Australia, but Australia is home to the largest herd of feral camels in the world. About 12,000 dromedary camels were brought to Australia in the mid 19th century to carry people and supplies during the explorat

发表于:2019-01-22 / 阅读(89) / 评论(0) 分类 自然百科2009年