单项选择题

They eventually plan to _______ the high-speed connections on 1,500 of their planes and sell the system to other airlines.

A．instruct
B．intrigue
C．install
D．inject
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单项选择题
The 17 th century English physician William Harvey discovered the _______ of the blood.
A．circulation
B．Circus
C．circumstance
D．circuit
单项选择题
In terms of economics, when business is _______ there is usually an increase in unemployment.
A．depressed
B．receded
C．degraded
D．declined
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