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.

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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.

单项选择题

Logging is not banned chiefly because

A．scientists are overestimating the damage.
B．people benefit economically from it.
C．some creatures are only threatened but not endangered.
D．it provides jobs to the consumers.