单项选择题

Over the centuries, various theories have been （） to explain the origin of alphabetic writing.

A．advanced
B．subjected
C．released
D．abandoned

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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
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
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