单项选择题

Experts disagree as to why crime rates have continued to fall. Some say the U.S. _______ economy has made crime less attractive.

A．rotary
B．robust
C．rigorous
D．reckless
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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
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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