单项选择题

The author seems to imply in the passage that

A．the grounds on which hemp is banned cannot be justified.
B．drug addiction is an even more serious problem of the world.
C．American Presidents can be exempt from the punishment of law.
D．marijuana is an addictive drug that should be banned worldwide.

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单项选择题

According to some scientists, Hemps are preferable to trees chiefly because

A．they are more easily cultivated.
B．they have been cultivated by many cultures for a long time.
C．they can produce more paper than trees.
D．they can provide more endurable fibers than trees.

单项选择题

Canadian forests will not face destruction if

A．alternative sources for paper products are found.
B．logging is banned by the local government.
C．consumers increase their environmental sensitivity.
D．Canadian Pulp and Paper Association reduce its production.