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.
单项选择题
A．He had lost the tickets for the theater.B．He had lost his briefcase.C．He had left his briefcase at home.D．He had left the tickets in the office.
A．He had lost the tickets for the theater.
B．He had lost his briefcase.
C．He had left his briefcase at home.
D．He had left the tickets in the office.
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