单项选择题

A．Quit delivering flowers.
B．Work at a restaurant.
C．Bring her flowers every day.
D．Leave his job to work for her.
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单项选择题
According to the text, the fundamental cause of the ice ages is.
A．periodic changes in the earth’’s orbit around the sun
B．fossil remains of one-celled animals
C．alternating cold and warm seasons
D．changes in distance of the earth from the sun
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