单项选择题

A．It is the regular rise and fall of ocean waters.
B．It comes definite times of each day.
C．It comes rushing in suddenly and unexpectedly.
D．Scientists can hold back a tidal wav
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单项选择题
A．Because winter holidays abroad is often at a reduced price.B．Because the Britons enjoy skiing.C．Because the weather in winter in Britain is nasty.D．Because they can go on a package holiday.
A．Because winter holidays abroad is often at a reduced price.
B．Because the Britons enjoy skiing.
C．Because the weather in winter in Britain is nasty.
D．Because they can go on a package holiday.
单项选择题
A．To visit more places in the city.B．To take a lot of pictures of the beautiful city.C．To take some pictures of his friends.D．To spare some time to meet his friends.
A．To visit more places in the city.
B．To take a lot of pictures of the beautiful city.
C．To take some pictures of his friends.
D．To spare some time to meet his friends.
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