单项选择题

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A.We are short of paper.
B.The printing is not important.
C.We should save paper.
D.We have to pay for the paper.
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单项选择题
A.Sixteen below zero.B.Six below zero.C.Sixteen above zero.D.Six above zero.
A.Sixteen below zero.
B.Six below zero.
C.Sixteen above zero.
D.Six above zero.
单项选择题
A.They change color every 50 minutes.B.They change color more quickly.C.They change color more slowly.D.They change color on the same schedule.
A.They change color every 50 minutes.
B.They change color more quickly.
C.They change color more slowly.
D.They change color on the same schedule.
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