单项选择题

Mind you. It's easy to have your pocket ______ in a big crowd.

A．pick
B．picking
C．picked
D．being picked
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单项选择题
Revenues from oil are the biggest single ______ in the country's income.
A．company
B．companion
C．component
D．compound
单项选择题
The ______ of medical knowledge are being pushed farther outwards as time goes on.
A．edges
B．borders
C．boundaries
D．frontiers
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