单项选择题

A．alleviates
B．worsens
C．reduces
D．enhances
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单项选择题
A．beginningB．startC．sourceD．origin
A．beginning
B．start
C．source
D．origin
单项选择题
Belfast has long been famous for its
A．oil refinery.
B．linen textiles.
C．food products.
D．deepwater port.
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