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
单项选择题
Which of the following is NOT-a reason suggested in the argument against death penalty
A．Death penalty is not humane.
B．Death penalty cannot really deter criminals.
C．Errors may occur in conviction of some offenses.
D．Death penalty was used to suppress revolutionary groups.
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