单项选择题

In order to prevent stress from being set up in the metal, expansion joints are fitted which ______the stress by allowing the pipe to expand or contract freely.

A．reclaim
B．reconcile
C．rectify
D．relieve
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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
单项选择题
The glass vessels should be handled most carefully since they are______
A．crisp
B．intricate
C．subtle
D．fragile
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