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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单项选择题
Why is pulp and paper production important to Canada
A．Canada needs to find a way to use all its spare wood.
B．Canada publishes a lot of newspapers and books.
C．Pulp and paper export is a major source of income for Canada.
D．Hemp is a traditional plant of Canada.
单项选择题
Why was hemp banned
A．It is related to the marijuana plant.
B．It can be used to produce marijuana.
C．It was no longer a useful crop.
D．It was destructive to the land.
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