单项选择题

A．Work.
B．Study.
C．Eat dinner.
D．See a movie.
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单项选择题
A．Every other day.B．Twice a week.C．Twice a day.D．Only during the summer.
A．Every other day.
B．Twice a week.
C．Twice a day.
D．Only during the summer.
填空题
Snow and ice can balance Earth’s climate by ______, but the never-ending melting of snow and ice, could cause land and oceans to switch from ______to ______ surfaces.
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