单项选择题

If I had not been _____ by the traffic jam, I would have been there by then.

A．interfered
B．postponed
C．delayed
D．prevented
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You will be liable _______ a heavy fine if you do that.
A．for
B．to
C．at
D．into
单项选择题
_______ in the color of sea water from blue to green seem to be caused by high or low concentration of salt.
A．Variations
B．Evaporations
C．Explorations
D．Explosions
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