单项选择题

A．Sixteen below zero.
B．Six below zero.
C．Sixteen above zero.
D．Six above zero.
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单项选择题
A．They change color every 50 minutes.B．They change color more quickly.C．They change color more slowly.D．They change color on the same schedule.
A．They change color every 50 minutes.
B．They change color more quickly.
C．They change color more slowly.
D．They change color on the same schedule.
单项选择题
Cigarettes manufacturers were eager to quit television and radio advertising because the cost of advertising was getting much higher.
A．Y
B．N
C．NG
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