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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单项选择题
Gathering of more than three persons were prohibited, supposedly in the name of______.
A．the law and the order
B．law and order
C．the order and the law
D．order and law
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
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