问题描述：
severe enough和so severe that有什么区别
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.
A severe enough for the United States Fish and Wildlife Service quite possibly to list it
B so severe that the United States Fish and Wildlife Service could well list it
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.
A severe enough for the United States Fish and Wildlife Service quite possibly to list it
B so severe that the United States Fish and Wildlife Service could well list it
问题解答：
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