gre考试阅读真题解析(B)
Although biological control appears to be the best solution to bracken infestation, careful assessment of the consequences is required.
Environmentalists are hoping that laboratory technicians will find a way to raise large numbers of moths in captivity.
Bracken is currently the best solution to the proliferation of nonnative moth species.
Even after researchers discover the most economical method of pest control, the government has no authority to implement a control program.
18. According to the passage, which of the following can be inferred about sheep ticks?
They increase where bracken spreads.
They are dangerous only to sheep.
They are especially adapted to woodland.
They have no natural enemies.
They cause disease among bracken.
19. The author cites all of the following as disadvantages of bracken encroachment EXCEPT:
Bracken is poisonous to farm animals.
Bracken inhibits the growth of valuable vegetation.
Bracken indirectly helps spread certain diseases.
Bracken is aesthetically objectionable.
Bracken disturbs habitats that some people would like to protect.
20. The final paragraph can best be described as
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