单项选择题

A．The Rhythmic Cycle of the Sun and the Tide
B．Discoveries in Biology
C．A Scientific Study
D．A Living Clock
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单项选择题
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.
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.
单项选择题
The people of Savannah offered to surrender because they did not want their city to be set on fire.
A．Y
B．N
C．NG
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