单项选择题

The 1986 Challenger space shuttle ______ was caused by unusually low temperatures immediacy before the launch.

A．dismay
B．disaster
C．expedition
D．controversy
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单项选择题
The glass vessels should be handled most carefully since they are______
A．crisp
B．intricate
C．subtle
D．fragile
单项选择题
This new laser printer is______ with all the leading software.
A．competitive
B．cooperative
C．compatible
D．comparable
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