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No.5-3-Sec5-T7 : 大学医院与社会医院治疗效果的差异。 P133
94-4-Sec2-T24: Grazing livestock on public land in the western
United States is not causing widespread environmental
damage in the region, since if it were, the condition
of that land would not be improving. However, only 14
percent of public land in the area today is considered
to have inadequate vegetation cover and. therefore. to
be in poor condition, while in the 1930s, 36 percent
had inadequate vegetation cover.
Which of the following, if true, most seriously weakens
the argument above?
In the western United States, private land is
typically more lush than public land, and cattle that
graze on private land can be fattened more quickly.
Since the 1930s, recreational users of public
land in the western United States have caused more
environmental damage than have the cattle grazing there.
During the 1930s, an unusually destructive drought
prevailed throughout the region where most public lands
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