单项选择题

His friend unexpectedly dropped in.

A．visited
B．stepped in
C．dropped off
D．met
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单项选择题
Wet clays can be easily molded into a form that they retain.
A．compressed
B．combined
C．placed
D．shaped
单项选择题
After years of research,Charles Drew devised a procedure for preserving plasma.
A．transporting
B．saving
C．reusing
D．labeling
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