三　学以致用

1.请运用读前策略与技能，思考并说明在完整阅读下面这篇文本之前，可以做些什么。请填写在下列方框中。

Human intervention in a natural environment,perhaps only slight and with good intentions may result in unwanted effects.A good example of this occurred in the Antilles in the 1870s.Sugarcane was a major crop there,but rats were eating the cane and nesting in the cane fields,causing a great deal of damage.In order to kill rats,several male and female mongooses,excellent rat hunters,were imported in 1872.In the next ten years,the mongooses flourished and the rat population was significantly reduced.But as the rat population decreased,mongooses began to eat the native birds,snakes,lizards,and turtles.As a result,the birds,snakes,lizards disappeared,and the insect population began to increase.With no natural predators to keep them in check,the insects began to do more and more damage to the cane fields.Mongooses imported to save cane fields ended up as the cause of a new problem.

2.请运用读中策略与技能，完成读中微课导学视频中要求的阅读练习（见附录1），并把所用到的策略和具体例子记录在下方，可以使用文字、图画、思维工具等多种形式进行记录。