单项选择题

Most of North America receives______some form of continuous plant cover except in the arid and semiarid Southwest.

A．moisture to sustain sufficient
B．sufficient moisture to sustain
C．to sustain sufficient moisture
D．sufficient to sustain moisture
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单项选择题
A few species of mushrooms cause death or serious illness______.
A．having eaten
B．that they are eaten
C．are eaten
D．when eaten
单项选择题
At the time of Columbus voyages, Native Americans used an astounding diversity of languages, ______the diversity used by Europeans.
A．the greatest by far
B．by far than greater
C．by far the greatest
D．greater by far than
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