单项选择题

Their happiness was very ______.

A．crisp
B．brittle
C．delicate
D．fragile
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单项选择题
It turned out that the children were not ______ for the accident.
A．to blame
B．to be blamed
C．to be blaming
D．to have been blamed
单项选择题
The Americans are a highly ______ people. Most of them like to travel whenever they get the chance.
A．mobilized
B．mobile
C．changeable
D．moved
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