单项选择题

Most science - fiction writers seek to persuade readers that the world they have created is ______ and is derived from scientific principles.

A．possible
B．impossible
C．certainly
D．unlikely
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单项选择题
I couldn't finish my paper because the computer ______.
A．took down
B．broke down
C．tore down
D．fell down
单项选择题
The lovely picture ______ me of my happy childhood.
A．retained
B．refreshed
C．recollected
D．reminded
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