问答题

It is in 1960s________________________(两国的贸易达到了最高点)．

【参考答案】

that the trade between the two countries reached its highest......

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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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