单项选择题

A．They led to the discovery of America.
B．They made American native foods popular.
C．They brought great wealth to Spain.
D．They made native American life styles well known.
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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.
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.
单项选择题
A．She thanks the man for his offer.B．She thanks the man and accepts his offer.C．She is not pleased with the man’’s offer.D．She thanks the man but declines his offer.
A．She thanks the man for his offer.
B．She thanks the man and accepts his offer.
C．She is not pleased with the man’’s offer.
D．She thanks the man but declines his offer.
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