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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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
单项选择题
The selection of medical professionals are currently based on ______.
A．candidates' sensitivity
B．academic achievements
C．competitive spirit
D．surer values
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