单选题
To invent the language clock the researchers studied and compared ______.
A、
tile pronunciation of language in different years
B、
the spelling of some languages in different centuries
C、
the vocabulary of languages in different times
D、
the grammar of some languages in different times
【正确答案】
C
【答案解析】
文章第二段倒数第二句They found that．．．pronounced differently，即他们是根据单词的使用情况来研究，而不是发音或拼写；三、四两段都是从词汇的角度进行了一系列对比，故选项C正确。
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