单项选择题


A．big
B．small
C．minor
D．major
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单项选择题
A．ofB．onC．toD．at
A．of
B．on
C．to
D．at
单项选择题
It is difficult to accurately predict earthquakes because______.
A．earthquakes may take place anywhere, anytime
B．earthquakes may happen unexpectedly under the sea
C．earthquakes may take place while people are asleep
D．the taking place of earthquakes involves many factors
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