By Lisa Schlein Geneva 23 August 2007 The World Health Organization warns new and emerging infectious diseases are spreading rapidly around the world threatening the health, economies and security of all nations. This year's World Health Report says

发表于:2019-01-13 / 阅读(142) / 评论(0) 分类 2007年VOA标准英语(八月)

At least 500,000 Liberians are affected by a plague of caterpillars that is destroying crops, polluting drinking water and spreading to neighboring Guinea. Aryworm At least 100 villages are affected in Liberia's richest agricultural region near the

发表于:2019-02-02 / 阅读(63) / 评论(0) 分类 VOA标准英语2009年(二月)