单项选择题

A．institutions
B．agencies
C．locations
D．sites
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单项选择题
A．dutyB．responsibilityC．obligationD．mission
A．duty
B．responsibility
C．obligation
D．mission
单项选择题
A．The library.B．The theatre.C．The research center.D．The laboratory.
A．The library.
B．The theatre.
C．The research center.
D．The laboratory.
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