单项选择题

A．its being multinational.
B．its simultaneous operation.
C．its major role of heroin supplier.
D．its major role of cocaine supplier.
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单项选择题
The Russia’s request for two computers was refused because the United States wanted to prevent their use in
A．US Customs Service.
B．Russia’s nuclear programme.
C．US Department of Commerce.
D．Russia’s non-military labs.
单项选择题
Participants in the conference differ greatly in their opinion about ______ to achieve the effective elimination of child labour.
A．how
B．when
C．why
D．where
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