单项选择题

What is the main idea of the passage

A．Hemp is not as dangerous as marijuana.
B．Hemp can be used to replace trees for paper industry.
C．Hemp planting can be a good way to protect environment.
D．Hemp has a prosperous future.

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单项选择题

Why do some people think hemp is better than trees for paper industry

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 planting can beautify the environment.
D．Hemp can produce paper of high quality.

单项选择题

Why was hemp banned in the United States

A．Because it can produce marijuana.
B．Because it is poisonous.
C．Because it is related to the marijuana plant.
D．Because it is harmful to human body.