单项选择题

According to the fifth rule, a pressure cooker cover should be opened （）.

A．as soon as the cooking is finished
B．while it is still on the stove
C．with force when it is hot
D．after it is cooled down

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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
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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