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
According to the passage, the American restaurant waiter may provide more service than required mainly because__________.
A．the American employers demand extra working hours for their workers
B．the American waiters depend greatly on tips from customers
C．it’’s a custom of the American society
D．the American waiters believe that customer is always right
单项选择题
A．Two decades.B．Three decades.C．Four decades.D．Five decades.
A．Two decades.
B．Three decades.
C．Four decades.
D．Five decades.
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