单项选择题

It could do considerable damage if it happened to hit some of the more ______ vessels.

A．elastic
B．vulnerable
C．fragile
D．flexible
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单项选择题
This is clearly troublesome and possibly unsatisfactory and many users might be ______ to abandon the process before achieving their ends.
A．simulated
B．tempted
C．distracted
D．elicited
单项选择题
High production rates are often achieved at the ______ of quality of work.
A．expense
B．exposure
C．expansion
D．expectation
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