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单项选择题
A．1.7 billion.B．1.7 million.C．30 billion.D．30 million.
A．1.7 billion.
B．1.7 million.
C．30 billion.
D．30 million.
单项选择题
A．In a store house.B．In a publishing house.C．In a library.D．In the English Department.
A．In a store house.
B．In a publishing house.
C．In a library.
D．In the English Department.
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