单项选择题

A．About twelve hours.
B．About thirteen hours.
C．About one day.
D．About one day and a half.
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单项选择题
There is less risk of mad cow disease in young cows.
A．Y
B．N
C．NG
单项选择题
A．He must have some money in a bank.B．He must sign a contact.C．He must pay the security deposit.D．He must clean his own room.
A．He must have some money in a bank.
B．He must sign a contact.
C．He must pay the security deposit.
D．He must clean his own room.
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