单项选择题

Your explanation is clear and ______ under discussion.

A．to the point
B．at the point
C．a case in point
D．on the point
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单项选择题
One of the requirements for a fire is that the material ______ to its burning temperature.
A．is heated
B．be heated
C．will be heated
D．has been heated
单项选择题
Primary batteries of cells are those that, once ______, are discarded.
A．to be discharged
B．being discharged
C．discharged
D．discharging
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