单项选择题

______ deserts are dry regions, visitors might come upon an area with trees and water.

A．Just because
B．Only when
C．As if
D．Even though
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单项选择题
Many species have ______ before man can document them properly.
A．finished
B．crushed
C．vanished
D．furnished
单项选择题
Few are so silly as to dash back into the house on fire to fetch the money ______ their lives.
A．at the rate of
B．at the risk of
C．in the interest of
D．in the case of
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