单项选择题

The price of fresh vegetables ______ according to the weather.

A．fluctuates
B．increases
C．soars
D．maintains
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单项选择题
We should recognize that every company and every person is part of a long ______ of customers and suppliers.
A．pool
B．line
C．stream
D．chain
单项选择题
It can be safely ______ that there is no living beings on that planet.
A．resumed
B．assessed
C．assumed
D．assured
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