单项选择题

It is mentioned in the passage that one has to pay tax according to （）.

A．how much education one has received
B．whether one is single or married
C．how old one's children are
D．where one lives

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单项选择题

According to the passage, to decide the exact amount of tax to be paid is （）.

A．simply
B．easy
C．difficult
D．interesting

单项选择题

Which of the following operations may be dangerous？（）

A．Overfilling the cooker with food and water.
B．Cleaning the cooker with detergent.
C．Cooling the cooker with cold water.
D．Setting too little cooking time.