单项选择题

From the passage, we can infer that language clock is ______.

A．a mechanic clock
B．a figurative clock
C．an electronic clockC. a diamond clock

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单项选择题

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

单项选择题

American researchers found that the language clock could help ______.

A．count the exact time by years
B．decide when the language came into being
C．make sure when the Aleuts left the mainland
D．determine how the time changed

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