单项选择题

The physical shape and coloring of many animals are the result of gradual （） to particular circumstances.

A．modification
B．variation
C．application
D．adaptation

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单项选择题
One study found that job applicants who make more eye contact are （） as more alert, dependable, confident and responsible.

A．referred
B．perceived
C．recommended
D．presumed
单项选择题
Gloves have been worn since prehistoric time for protection. for ornamentation, （） social status.

A．and as an indication of
B．for they indicate
C．indicating
D．to indicate and
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