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．All the passengers were killed.B．The plane crashed in the night.C．No more survivors have been found.D．It’’s too late to search for survivors.
A．All the passengers were killed.
B．The plane crashed in the night.
C．No more survivors have been found.
D．It’’s too late to search for survivors.
单项选择题
A．To check the accuracy of scales.B．To calculate the density of other metals.C．To observe changes in the atmosphere.D．To measure amounts of rainfall.
A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.
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