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 lan
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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.
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 Canad
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