单项选择题

International ______ rates tend to fluctuate significantly from day to day due to a variety of economic factors.

A．exchange
B．trade
C．frequency
D．substitution
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单项选择题
The Fresco Transportation website is______ regularly to provide the latest information on bus routes and train schedules.
A．update
B．updating
C．updated
D．to update
单项选择题
Every home entertainment system from Bryan's Electric comes with a two-year warranty and free ______ .
A．interaction
B．installation
C．decline
D．proposal
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