单项选择题

A．changed market demand
B．changed OPEC policy
C．security situation in Saudi Arabia
D．U.S, policy toward Saudi Arabia
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A．a zoo with various animalsB．a market selling various animalsC．an organization for the protection of animalsD．an organization for the protection of children
A．a zoo with various animals
B．a market selling various animals
C．an organization for the protection of animals
D．an organization for the protection of children
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