单项选择题

A terrible accident happened; people were saddened when they watched the ________ sight on TV.

A．panic
B．pathetic
C．pathetic
D．periodic
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单项选择题
The political future of the president is now hanging by a ________.
A．thread
B．cord
C．string
D．rope
单项选择题
An important property of a scientific theory is its ability to ________ further research and further thinking about a particular topic.
A．stimulate
B．renovate
C．arouse
D．advocate
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