单项选择题

This passage might be subtracted from

A．a book preface
B．a scientific magazine
C．a physical paper
D．an investigation report
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单项选择题
The two-step cutback mentioned by some of the ministers is to ______.
A．stop producing more petroleum and cut off the petroleum by one million barrels per day
B．produce no more than the quota and make their quota 23.5 million barrels per day
C．stop producing 24.5 million barrels per day and then lower the output quota by one million barrels per day
D．lower the output by one million barrels per day and produce exactly the quota
单项选择题
The decision may not be so easy to be implemented because ______.
A．the high prices can be in the $ 30 above range and continue rising
B．the high prices will be too attractive for OPEC countries to reduce the output
C．the price turns out to be an incentive for producers in non-OPEC countries
D．non-OPEC countries refuse to follow the decision and won't cut their output off
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