Not long before, some farmers were worried because hawks (老鹰) were taking many of their chickens. They didn’t know what to do with it. Then they wanted to kill the hawks to protect their chickens. However, after killing many hawks, a new problem appeared. There were more field mice (田鼠). The mice ate up many of their crops (庄稼). The farmers didn’t know why. In fact, hawks eat not only chickens but also field mice. And they eat more field mice than chickens. When the farmers killed lots of hawks, they changed the balance of nature (生态平衡).
When people move into a new place, they often cut off many wild plants. ①Without enough plants, animals will die or leave the place. For example, in the USA, in order to protect the deer, people killed many tigers. As a result, The number of the deer was growing more and more. After the deer ate up the roses (玫瑰花), they ate the young trees. At last the deer had nothing to eat and many of them died.
②important, the balance of nature, keep, us, for, it’s, to.
根据短文内容，完成任务。
任务一：判断正（T）误（F）。
Hawks only eat chickens.
Killing tigers is not a good way to protect the deer.
任务二：将文中①处画线句子翻译成中文。
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任务三：将文中②处画线部分组成一个完整的句子。
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任务四：回答问题。
The passage mainly tells us       .

A．how to kill the hawks

B．the importance of keeping the balance of nature

C．why the farmers killed the tigers

D．people like chickens and deer better than hawks and tigers