单项选择题

The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.

A．bad they been done
B．they had been done
C．having been done
D．they were done
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单项选择题
There should be room for programs of world news within children's ______ .
A．range
B．scope
C．room
D．sight
单项选择题
The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not ______ .
A．thaw
B．dissolve
C．melt
D．fuse
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