单项选择题

A． He smoked before now.
B． He likes smoking.
C． He never smokes.
D． He is starting to smoke.
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填空题
The professor, as well as his assistants, (do) _______the experiment in the lab forty hours a week.
单项选择题
According to the first rule, the user should_________.
A．keep the cooker under close watch
B．always keep the cooker half full
C．never leave the cooker empty
D．never turn off the stove
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