科学家研究了某地鸟类濒危或受到威胁的原因,结果如下表:原因偷

科学家研究了某地鸟类濒危或受到威胁的原因,结果如下表:

原因

偷猎

栖息地丧失

外来物种的影响

其他原因

比例

20%

60%

12%

8%

由上述结果看出,保护鸟类最有效的措施为

A.大力开展爱鸟周活动,加强爱鸟宣传      B禁止偷猎

C.控制外来物种的引入                        D建立自然保护区

答案

D

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