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文章结构分析:Paragragh 1: While natural disturbance does setback ecosystems, it mostly leads to a long-term recovery. In contrast, the stressor from human activities often cause ireversible environmental degradation.
Paraghragh 2: The expansion of shrub invade the space initially for grass.
Paragragh 3: The invasion of shrub is actually a self-enforcing, perpetuating cycle because it creates bare patches vulnerable to further erosion.
Paragragh 4: The invasion of shrub is triggered and made worse by human activities, which reduce the soil intergrity.
我的答案:D C B C C
正确答案:D C B C C
CR
我的答案:B A
正确答案:C? C?
这两题我都觉得怪怪的。
第一题:C 是纯纯重复前提哇。
“prone to illness” 就是“lower rate”的取反哇。而且灯只有开或不开两种状态,没有”半开半关“的中间状态。所以也不存在”开灯增加概率,不开灯减少概率“的逻辑。不理解*1
第二题:题目是要比较 new road 和 new lane 的优劣。
C 里面比较了拥堵和new road的优劣完全没意义哇,而且原文也没提cost。
A 虽然也很牵强,但至少可以evaluate 一下“new lane”会导致“more vehicle”的前提哇。 不理解*2
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