单项选择题

The _______ cause of laying off skilled workers in the factory was bad management.

A．negative
B．negligible
C．prevalent
D．prime
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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
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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