单项选择题

A．Big waves pose a threat to commercial navigation.
B．The river current never flows faster ten miles per hour.
C．The river reverses its flow several times a day.
D．High tides can create sudden and unexpected rapids.
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单项选择题
A．There has been a lot of controversy over the use of flagB．The best athletes can wear uniforms with the design of the flagC．There are precise regulations and customs to be followedD．Americans can print the flag on their cushions or handkerchiefs
A．There has been a lot of controversy over the use of flag
B．The best athletes can wear uniforms with the design of the flag
C．There are precise regulations and customs to be followed
D．Americans can print the flag on their cushions or handkerchiefs
问答题
Hilton Hotels believes it won’’t be long before it is possible to build a________.
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