摘要：Spare that spider 不要伤害蜘蛛 Why, you may wonder, should spiders be our friends? Because they destroy so many insects, and insects include some of th ...... 
[发表于：2017年05月06日 浏览：247次 阅读全文]
摘要：Finding fossil man 发现化石人 We can read of things that happened 5,000 years ago in the Near East, where people first learned to write. But there are ...... [发表于：2017年05月06日 浏览：225次 阅读全文]
摘要：The Most Important Quality of a College Student Many people describe their college years as the best time of their lives.However,not every student achi ...... [发表于：2017年04月11日 浏览：119次 阅读全文]