The reading passage proposes threes illustrations to provide support that the number of birds decline greatly because of human activities. However, the professor in the lecture casts doubt on the accuracy of those illustrations by addressing her own opinion.
In the first place, the author declares that birds' nature habitats are threatened by increasing human populations and settlements. For example, forests, wetlands and grasslands have been transformed into homes, malls and offices. Birds decrease because of lack of natural habitats. The lecturer, on the contrary, points out that this explanation is not true, because some kinds of birds, like hawks, cannot be found in urban areas, but the number of other birds may increase. It is hard to say the total number of birds is increasing or decreasing.(最后这句话最好换一下哟~~原文是说说整体的数目下降了是不对滴~~还有就是阅读的写一句话就好了呢,ETS重听力细节呢~~)
In the second place, the writer makes a claim that not only human settlements but also increasing agricultural activities should take responsibility to decreasing number of birds.The speaker, in contrast, argues that in US, people prefer employ more productive crops to convert wilderness areas into agricultural use ones. (这里的听力点有点少呢~在多加一个细节就完美了呢~~)
In the third place, the reading material asserts that pesticides can be a disaster for birds, since they are poisonous to both insects and birds. As opposed to this explanation, the lecture challenges the assertion by stating that people have already made effort to change this situation. There are two major changes. The first one is that scientists have invented pesticides less poisonous to birds. The second one is that pest-resistance crops are growing by farmers. (最后端不错呢~~) |