单项选择题

A．At a shopping center.
B．At an electronics company.
C．At an international trade fair.
D．At a DVD counter in a music store.
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单项选择题
A．too honestB．enough honestC．honest enoughD．so honest
A．too honest
B．enough honest
C．honest enough
D．so honest
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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