单选题A pharmaceutical company tested a new painkiller on 1,000 lab rats that were fed large doses of the painkiller for a two-month period. By the end of the experiment, 39 of the rats had died. The company concluded that the painkiller was sufficiently safe to test on humans. Which of the following, if true, provides the most support for the pharmaceutical company’s conclusion?AThe amount of painkiller fed to the rats was substantially greater, in relation to body mass, than the dosage any human would take under normal circumstances.BBecause of the different body chemistry of humans and rats, some compounds can be dangerous for rats but safe for humans, and vice versa.CTests of this same painkiller on dogs showed that 3 out of 50 dogs developed lesions on their livers during the course of the experiment.DThe researchers found that during the experiment, the rats showed a significantly lower sensitivity to pain than rats do under normal circumstances.EIn an experiment of this length with this number of rats, it is not unusual for up to 50 rats to die during the experiment for reasons unrelated to the experiment itself.
单选题
A pharmaceutical company tested a new painkiller on 1,000 lab rats that were fed large doses of the painkiller for a two-month period. By the end of the experiment, 39 of the rats had died. The company concluded that the painkiller was sufficiently safe to test on humans. Which of the following, if true, provides the most support for the pharmaceutical company’s conclusion?
A
The amount of painkiller fed to the rats was substantially greater, in relation to body mass, than the dosage any human would take under normal circumstances.
B
Because of the different body chemistry of humans and rats, some compounds can be dangerous for rats but safe for humans, and vice versa.
C
Tests of this same painkiller on dogs showed that 3 out of 50 dogs developed lesions on their livers during the course of the experiment.
D
The researchers found that during the experiment, the rats showed a significantly lower sensitivity to pain than rats do under normal circumstances.
E
In an experiment of this length with this number of rats, it is not unusual for up to 50 rats to die during the experiment for reasons unrelated to the experiment itself.
参考解析
解析：
如果规定的死亡率高于该公司实验得到的结果，那么该公司的决定便可以得到支持，故本题应选E项。
如果规定的死亡率高于该公司实验得到的结果，那么该公司的决定便可以得到支持，故本题应选E项。
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