单项选择题

The water level of the oceans rises and falls ______.

A.often
B.often in a year
C.twice
D.twice a day
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单项选择题
We have low tide ______.
A.when water reaches its highest level
B.when water stops
C.when water no longer moves
D.when water reaches its lowest level
单项选择题
Shining down out of the blue sky, ______.
A.their pale skins were burnt by the sun
B.they were burnt by the fierce sun
C.the sun burnt their tender skins
D.the sun burning their pale skins
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