单项选择题

A．Modern industry must have developed before the Middle Ages.
B．Modern industry must have developed around the 19th century.
C．Modern industry must have developed in Greece or Rome.
D．Modern industry must have developed machines to take tests.
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单项选择题
A．The shape of the dust particles in the air. B．The relative humidity. C．The temperature of the air. D．The geography of the area.
A．The shape of the dust particles in the air.
B．The relative humidity.
C．The temperature of the air.
D．The geography of the area.
单项选择题
A．The water was too cold. B．The water was too deep. C．She doesn’t know how to swim. D．She didn’t have enough time.
A．The water was too cold.
B．The water was too deep.
C．She doesn’t know how to swim.
D．She didn’t have enough time.
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