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
单项选择题
A．Saying sorry to bother him.B．offering him some help.C．Asking help from him.D．Complaining some problem with her.
A．Saying sorry to bother him.
B．offering him some help.
C．Asking help from him.
D．Complaining some problem with her.
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