单项选择题

A．15 hours.
B．16 hours.
C．18 hours.
D．19 hours.
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单项选择题
A．unsinkableB．perfectC．unpreparedD．unusually
A．unsinkable
B．perfect
C．unprepared
D．unusually
单项选择题
A．which is very richB．with only more than one million populationC．which produces oilD．all the above
A．which is very rich
B．with only more than one million population
C．which produces oil
D．all the above
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