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题目材料：

Spoleto grass has begun to grow along the Coyote River, driving out the local population of native willows, which constitute the world's only known habitat of the golden-horned snail. A proposed dam across the river, if built, will diminish the river's flow, thereby encouraging the spread of the Spoleto grass and hastening the loss of the willows. Therefore, construction of the dam will most likely bring about the golden-horned snail's extinction.

第1题

Which of the following is an assumption on which the argument depends?

A.Construction of the dam will not threaten with extinction the kind of willows that grow along the Coyote River.
B.Spoleto grass Will not provide a better habitat for golden-hormed snails than that currently provided by the willows.
C.Spoleto grass does not provide shelter for small animals that prey on the golden-horned snail.
D.The golden-horned snail once lived in willows that grew along rivers other than the Coyote.
E.Spoleto grass grows only along the banks of rivers.

B显示答案

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