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.
单项选择题
The passage implies that______.
A．switchgrass is the most ideal raw material for the cellulosic ethanol production
B．corn-based ethanol has higher energy rate than switchgrass-based ethanol
C．corn-based ethanol has been invented and is being refined, but not commericalized
D．switchgrass is directly used as raw material for the cellulosic ethanol production
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