单项选择题

A．offers
B．produces
C．increases
D．enhances
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单项选择题
A．profitB．advantageC．incomeD．disadvantage
A．profit
B．advantage
C．income
D．disadvantage
单项选择题
A．opposite toB．close toC．different fromD．similar to
A．opposite to
B．close to
C．different from
D．similar to
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