单项选择题

From the passage we know switchgrass is ______.

A．a biochemical product
B．a kind of animal
C．a kind of grass growing very fast
D．a kind of grass growing in a specific soil
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单项选择题
A．The kilogram.B．The energy content.C．Heat energy of water.D．The calorie.
A．The kilogram.
B．The energy content.
C．Heat energy of water.
D．The calorie.
判断题
The Bush Administration opposes tightening the arsenic standard for drinking water.
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