tpo2第一个阅读的第12题不明白

zhanghq0UID: 2762886

答案给的是第二个位置，可是后面明明写着过度放牧的后果，根本一个字都没有提现代机械化农业的论点。为什么不是第四个位置？

zhanghq0UID: 2762886

居然没人理我……

史殿金UID: 3319267

Paragraph 7: ■The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation. ■The consequences of an excessive number of livestock grazing in an area are the reduction of the vegetation cover and the trampling and pulverization of the soil. ■This is usually followed by the drying of the soil and accelerated erosion. ■

12. Look at the four squares [■] that indicate where the following sentence can be added to the passage.
This economic reliance on livestock in certain regions makes large tracts of land susceptible to overgrazing. Where would the sentence best fit?
黑体字中的this代词，表明说前面肯定在谈economic reliance on livestock in certain regions;根据这个信息skim发现第一句话里面的The raising of livestock is a major economic activity，然后尝试将黑体字置于■2，黑体字与前文衔接合理：在在半干旱地区，家畜饲养是一项主要经济活动。这种对于畜牧业的经济依赖使得土地容易过度放牧。与后面衔接合理：过度放牧的结果是。。。符合逻辑。

laotaitaiUID: 3143871

肯定是2

laotaitaiUID: 3143871

解释合理