单项选择题

According to the second rule, too much liquid in the cooker may result in （）.

A．a ruined meal
B．undercooked food
C．too little pressure
D．a blocked vent pipe

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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
单项选择题
______ is quite difficult for Mary to pass the interview.
A．What
B．This
C．That
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