单项选择题

A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
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单项选择题
Where did the bricks early used in London probably come from
A．Europe.
B．Ancient Egypt, in India, and in the Roman Empire.
C．The brickworks in southeast England.
D．It was not mentioned in the passage.
填空题
mathematics
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