外语乐园感谢参加前三期活动的所有会员,第四期活动继续推出...This week's theme is pretty interesting, it's about leaf-cutting ants, so enjoy yourself! 本次活动内容选自DISCOVERY探索发现频道, 是国外著名的科教节目, 发音标准清晰,非常有利于提高听力, 不管是四六级还是托福听力都会有所帮助,当然, 考试不是目的, 大家看了视频能多了解些知识就好.活动截止时间: 本周六晚. 记得加密100.活动有35浮云奖励,前三个活动回复者另加5fy..加密方法:你发帖的左下方有 "加密此贴" 四个字, 在前面的方格打勾,然后后面长格子的"0" 改为"100"(还有不知道的发短消息给我..)
参考答案:
Workers from a colony of leaf-cutting ants are harvesting leaves to take back to their nests. With their sissor-like jowls, they easily cut leaves to manageable size. But some skill is needed for the next stage when the leaf is hoisted into the position for the journey ahead. For some the problem may be too much help. For others just a sudden a path of wind. But there are exceptions. For most ants it's only the first step in the long track back to the nest, which maybe a hundred yards or more away. They follow a chemical trail laid down by the workers that first scour this tree, so they seldom go astray. The leaf fragments that they carry are not for eating. Instead, they are employed by the ants that are remarkable system of farming. The leaves are used to culture the fungals that is the only food source for the ants and their brood. Here in the underground garden, the leaves are cut into much smaller pieces and carefully cleaned, probably to remove any spores that may contaminate the pure culture. The leaf edges are chewed to a wet pulp. And a clear drop of body fluid is added to create the perfect fundation for the precious fungals that sustains the colony. 下载[ 此贴被channing在2007-10-22 17:58重新编辑 ]
