单项选择题

The students showed ______ when solving the difficult maths problems.

A．validity
B．purity
C．ingenuity
D．reliability
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单项选择题
For a little while the girl ______ for her dead cat, but she got over it after a few days.
A．ached
B．depressed
C．grieved
D．upset
单项选择题
Modern sonar makes it possible to ______ an underwater submarine.
A．communicate
B．sink
C．search
D．locate
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