【简答题】A More than two thirds of the world ’ s polar bears will be wiped out by 2050 , according to a shocking new study.By then , scientists say , global warming will have melted 42 percent of the Arctic se...
【简答题】LONDON ( Reuters)-- Ecotourism ( 生态旅游) is causing a lot of damage to wildlife and may be enering the survival(生存) of the very animals people are flocking to see, according to researchers. Biologis...
【单选题】听力原文: During the nineth century, when little was known about environmentalism and conservation, it was common to hear people say that the resources of the sea were unlimited. They believed the wor...