第1个回答 2013-04-24
Due to use pesticides, environmental pollution, the bird is less and less, bird eat insects, are human's good friends, we should try to protect them.
第2个回答 2013-04-24
As a result of enviroment pollution caused by the use of pestcides,the number of birds is increasingly decreased.As Birds eat injurious insect,they are our friends,and we should protect them.