单项选择题

A．A hundred years ago.
B．Three centuries ago.
C．After America was discovered.
D．Long before America was discovered.
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单项选择题
A．People’s sewage and garbage.B．Sea plants and small animals.C．Dead fish.D．Ships and submarines.
A．People’s sewage and garbage.
B．Sea plants and small animals.
C．Dead fish.
D．Ships and submarines.
单项选择题
A．To the bank.B．To the office.C．To the barbershop.D．To the department store.
A．To the bank.
B．To the office.
C．To the barbershop.
D．To the department store.
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