单项选择题

Obviously, the Chairman's remarks at the conference were _______ and not planned.

A．simultaneous
B．supplementary
C．instantaneous
D．spontaneous
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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
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
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