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
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单项选择题
Which of the following sentences is not true according to the passage
A．After 3 000 years, each daughter language shared only 29% of the basic 200-word vocabulary.
B．Some Aleuts are the descendants of Eskimos on the mainland of Alaska.
C．The language clock can help to determine the dates of certain events.
D．Through thousands of years languages change only in vocabulary.
单项选择题
Generally speaking, after 4 000 years, on the average, the percentage of the 200 original words which remained in use was ______.
A．81%
B．66%
C．43%
D．29%
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