单项选择题

A．Biology textbook.
B．Scientific essay.
C．Science fiction.
D．Science report.
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单项选择题
A．It is an act of despair.B．It is an act of selfishness.C．It is the result of a sudden decision.D．It is the result of a sense of guilt.
A．It is an act of despair.
B．It is an act of selfishness.
C．It is the result of a sudden decision.
D．It is the result of a sense of guilt.
单项选择题
A．At the bank.B．At the customs office.C．At the library.D．At the post office.
A．At the bank.
B．At the customs office.
C．At the library.
D．At the post office.
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