4.21综合改改后
改4.21 综合 The main topic is about whether human population and the corresponding results in the decline of bird's number or not. The writer gives three reasons while the lecturer thinks these proposes are all unconvincing with following points.
To begin with, the narrator disagree with the author's view that human's expanding settlements cause natural habitats of birds to disappear. Instead, the narrator holds that birds' habitats are better and larger since human populations are bigger and bigger more and more(用more and more), and the bird's nest is available even in cities. By the way, though some number of birds decline, other number of birds do increase. For instance, the number of pigeon in unban area is bigger and bigger.(要是把例子写出来就更好了)
Moreover, the writer declares that bird habits have to give way to agricultural activities in rural areas. On contrary, the lecturer disproves with this point, and he argues: with the advent of a new crops which is able to produce more rice in less area, thesethere(there) is enough room for people to grow crops. Therefore, the bird habitats need not be converted to agricultural use.
Besides, the writer puts forwards with the harm that pesticides exert on bird. Conversely, the professor regards it as an uncorrected excuse. And he refutes the side-effects by two evidence. On the one hand, different from the traditional pesticides, scientists invent a new kind of pesticides which is friendly to birds. On the other hand,the recent introduction of crop has the same function as pesticides to expel pests,the recent introduction of pest-resist crop could cut down the use of pesticide.(这句细节有问题,pesticide的作用是杀虫,而新作物的作用是不吸引害虫。两者是不同的影响。) thus, making birds avoid suffering from pesticides.
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