B、EZ订购了额外的卡车,但作者并没有说明ABC现在的计划,可能ABC也在订购额外的卡车。即使ABC不订购额外的卡车,但是ABC现有的20辆卡车可能比较新,运载能力比EZ的卡车强。
C、怀疑调查样本的基数以及选择的随机性。如果这两个不能够满足的话,该调查就不具有说服力。另外,调查者是否说了真话?如果该调查采用了有利益的方式,则被调查者很可能因为最求利益而说假话。即使该调查具备上面说的条件,具有说服力,该调查也只能反映1年前的情况,并不能够代表现在的情况。
18.The following appeared in an editorial in a Prunty County newspaper.
In an attempt to improve highway safety, Prunty County recently lowered its speed limit from 55 miles per hour to 45 on all major county roads. But the 55 mph limit should be restored, because this safety effort has failed. Most drivers are exceeding the new speed limit and the accident rate throughout Prunty County has decreased only slightly. If we want to improve the safety of our roads, we should instead undertake the same kind of road improvement project that Butler County completed five years ago: increasing lane widths and resurfacing rough roads. Today, major Butler County roads still have a 55 mph speed limit, yet there were 25 percent fewer reported accidents in Butler County this past year than there were five years ago.
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