单项选择题

Why was tee plant hemp essential to world-wide trade in the past

A．Ships' ropes were made from it.
B．Hemp was a very profitable export.
C．Hemp was used as fuel for ships.
D．Hemp was used as food for sailors.
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单项选择题
According to its proponents ,four tines as much paper can be produced from land using hemp rather than trees. What does proponents mean
A．People who are against something.
B．People who support something.
C．People in charge of something.
D．People who do research on something.
单项选择题
Why do agriculturalists think that hemp would be better for paper production than trees
A．It is cheaper to grow hemp than to cut down trees.
B．More paper can be produced from the same area of land.
C．Hemp produces higher quality paper.
D．It causes less pollution of the environment.
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