阅读部分需要提取的观点是:
- Main point: 提供了三个控制蔗蜍数量的方法
- Sub point 1: 建立全国范围性的围栏
- Sub point 2: 组织志愿者抓
- Sub point 3: 研制某种特殊病毒,阻碍蔗蜍的成熟和繁殖
听力材料:
The cane toad wont be as easy to get rid of as the reading suggests. The measures proposed by the reading are likely either to be unsuccessful or to cause unwanted environmental damage.
蔗蜍不会像阅读部分说的那么容易出去的。阅读部分提供的观点不但是不会奏效,甚至会对环境造成损害。
First of all, a national fence probably wont stop the spread of the toad. Thats because young toads and toad eggs are found in rivers and streams. No matter where the fence is located, at some point there will be rivers or steams flowing from one side to the other. These waterways will be able to carry the young toads and their eggs to the other side. Since its only necessary for a few young toads or eggs to get though the fence in order to establish population on the other side, the fence is unlikely to be effective.
首先,一个全国范围内的围栏不会阻止蔗蜍的蔓延。这是因为蝌蚪和蔗蜍卵是生活在河水和溪流中的。不管围栏怎么安排,总会有跨过河流和小溪的地方。在这些地方,流水可以越过围栏。蝌蚪和蔗蜍卵可以通过这些水流穿过围栏。只要有很小数量的蝌蚪和蔗蜍穿过围栏,它们就可以建立起一个种群。所以,这种围栏的方法是无效的。
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