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【单选题】
The last sentence in the first paragraph, 'Mayoral knew no one who had been close to a healthy gray whale and lived' means ______.A.
nobody had ever approached a living whale
B.
among his friends no one saw any whale that was still alive
C.
no one he knew had ever touched a living whale
D.
whales would cat up anyone they catch without exception
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【简答题】Charcot 三联症
【多选题】频数分布表和频数分布图的主要用途有()
A.
揭示数据分布的特征和类型
B.
帮助研究人员改动数据
C.
帮助发现可疑数值
D.
以便进一步进行统计分析
E.
帮助读者加深对数据资料的印象