单项选择题

According to the article, a population explosion of elk and deer was caused also by ______.

A．the adoption of a policy of aggressive predator elimination
B．the increased number of Nation Parks
C．the decreasing number of visitors to National Parks
D．the heavy exploitation of endangered animals in the 20 century

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热门试题

单项选择题

Which one of the following statements is NOT true according to the article

A．Park managers interrupted the forest ecosystems through out the 20th century.
B．Flesh-eating animals should not be eliminated.
C．Insect suppression may cause the forests to over-mature.
D．Severe damage to native vegetation in the forest is caused by fire.

单项选择题

According to the article, strict wildlife protection laws and improved wildlife management techniques ______.

A．caused the near extinction of the endangered animals
B．intervened the natural process
C．made the visit of National Parks relaxing, and inspiring and rejuvenating
D．saved the elks in the Rocky Mountain Park from starvation