单项选择题

The police have asked for the ______ of the public in tracing the whereabouts of the missing boy.

A．cooperation
B．advice
C．helpfulness
D．aid
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单项选择题
Tension within a family is often relieved or eliminated when the family as a whole is threatened by______ force.
A．internal
B．external
C．intensive
D．extensive
单项选择题
He failed once again in his experiment, but he didn't feel ______.
A．frustrated
B．encouraged
C．puzzled
D．endangered
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