单项选择题

The price fluctuation of crude oil is caused by ______.

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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单项选择题
He first became aware of a racial disparity because of ______.
A．the vagueness of his African ancestry
B．the unfair treatment of him at school
C．the miserable sufferings of the slaves
D．the inhibitions haunting his parents
填空题
African
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