单项选择题

A．The first period of cold, wintry days in autumn.
B．The turning of color and falling of leaves.
C．A large mass of warm tropical air carried northward.
D．The southwestern winds.
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单项选择题
A．Driving a car.B．Taking a taxi.C．Going by train.D．Taking the subway.
A．Driving a car.
B．Taking a taxi.
C．Going by train.
D．Taking the subway.
单项选择题
According to Isaac-Mohr, increased selectivity means better students are going to all colleges.
A．Y
B．N
C．NG
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