标题: a logic question to discuss [打印本页] 作者: juleyi 时间: 2002-8-25 18:02 标题: a logic question to discuss
哪位兄弟姐妹帮分析一下逻辑思路：
In the arid land alomg the Colorado River, use of the river's water supply is strictly controlled: farms along the river each have a limited allocation that they are allowed to use for irrigation. But the trees that grow in narrow strips along the river's banks also use its water. Clearly, therefore, if farmers were to remove those trees, more water would be available for crop irrigation.
A. The trees along the river's banks shelter it from the sun and wind, thereby greatly reducing the anount of water lost through evaporation.
C. Many of the tree species currently found along the river's banks are specifically adapted to growing in places where tree roots remain constantly wet.
D. The strip of land where trees grow along the river's banks would not be suitable for growing crops if the trees were removed.作者: primefang 时间: 2002-8-25 20:15
