单项选择题

The political future of the president is now hanging by a ________.

A．thread
B．cord
C．string
D．rope
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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
单项选择题
When they finished playing, the children were made to ________ all the toys they had taken out.
A．put off
B．put out
C．put up
D．put away
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