单项选择题

The author's main criticism of John Lott is that he ______.

A．advocates private ownership of firearms
B．is not objective in his analysis
C．has analyzed a wrong period
D．has cited dubious statistics

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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

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 fir

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