单项选择题

A．The weather gets hotter.
B．Telegraph wires stand still.
C．Swallows sit on telegraph wires.
D．People find the mystery of migration
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单项选择题
A．by the 1920sB．by the 1910sC．by the 1950sD．by the 1930s
A．by the 1920s
B．by the 1910s
C．by the 1950s
D．by the 1930s
填空题
appearing
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