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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单项选择题
In the first paragraph, No ifs, ands or buts probably means ______.
A．Unintentionally
B．Inevitably
C．Impressively
D．Unconditionally
单项选择题
Why was the 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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