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题库 / Prep2007E1-SC-94
The decline of the mountain yellow-legged frog in the high reaches of the Sierra Nevada has become severe enough for the United States Fish and Wildlife Service quite possibly to list it as an endangered species in the near future.
severe enough for the United States Fish and Wildlife Service quite possibly to list it
severe enough so that the United States Fish and Wildlife Service could well list them
severe enough for it quite possibly to be listed by the United States Fish and Wildlife Service
so severe that the United States Fish and Wildlife Service could well list it
so severe that they could well be listed by the United States Fish and Wildlife Service
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enough to不表示因果关系，so that如此……以至于……
数量下降如此严重，以至于科学家把它列入濒危名单
归因：规则生疏
想用复数来指代整个青蛙种群，但是全句没有复数名词而且frog前面加了the，还是用it吧
主谓一致，yellow-legged frog用单数，杀BE
AC、redundancy
enough to不好，不能指“以至于”
"enough for xxx to happen" is a threshold. this is going to be some EXACT boundary at which something starts to happen.
paired with "quite possibly", this creates a contradiction. Eliminate A and C.
未划线部分as an endangered species可排除B（them）
如此严重以至于……
severe enough for it quite possibly to be listed by the United States Fish and Wildlife Service.
enough 指已经足够了
quite possible 指很有可能
重复了！！！！而且enough 与possible 有点矛盾
A: "enough for xxx to happen" is a threshold. this is going to be some EXACT boundary at which something starts to happen.
paired with "quite possibly", this creates a contradiction.
enough to 不是因果
B中enough so that连用, 排除。
E中的they与the mountain yellow-legged frog的数不一致，排除。
A和C中的for作状语，修饰become。
错选A，enough与possible矛盾，同排除C。
BD应该是it，排除。
A: enough to do 不能表达因果关系，so... that/so as to可表示因果。
不知道怎么选错的呢。。。。D明明表意清晰简洁。A的enough for 和quite possible 有重复。
A: "enough for xxx to happen" is a threshold. this is going to be some EXACT boundary at which something starts to happen.
paired with "quite possibly", this creates a contradiction.
主动优于被动
并不是主动优于被动，而是E选项They无指代，应该用it
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主客观问题，如果是enough for sb to do ,应该是可以的，但是这里的机构应该是按照客观规定来运作，下降到某个列入名单的客观标准后才能进行List，所以使用从句客观性比较强
A: "enough for xxx to happen" is a threshold. this is going to be some EXACT boundary at which something starts to happen.
paired with "quite possibly", this creates a contradiction.
A: "enough for xxx to happen" is a threshold. this is going to be some EXACT boundary at which something starts to happen.
paired with "quite possibly", this creates a contradiction.
这个感觉a也对啊，enough to do？？
enough to do本身没错，但是在这道题目中不对。因为，这道题目的意思是，下降非常严重，如此以至于可以被列入濒危动物了。下降非常严重并不会直接导致被列入濒危动物，只是说，下降的严重，如此以至于达到了被列入的标准。
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虽然知道C选项最好， 找不到A选项的错误哎。
enough身后的是for sb. to do sth.，这是不定式短语，答案选项D是结果状语从句，考了不定式和从句的区别。
可是不是应该用不定式吗？become约束力不强吗？
不定式表示的是一种“主观性”，即，表达一种状态的转换（start-stop）。
从句表示的是一种“客观性”，即，表达一种状态的稳定（process）。
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