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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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

单项选择题

From the passage we can draw the conclusion that ______.

A．the personality of a child is well established at birth
B．family influence dominates the shaping of one' s characteristics
C．the development of one' s personality is due to multiple factors
D．B-type characteristics can find no place in a competitive society