单项选择题

According to the author, our young theorists

A．would spend the whole life in the United States
B．mostly graduated from the U.S. institutes of technology
C．all choose the physics as their favorite major
D．wonder the way in which their theories are tested
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单项选择题
OPEC countries choose April 1 as the beginning day to lower the output quota because ______.
A．they expect to keep high oil prices for several months
B．it will take several months until April before they get ready
C．the first step of cutback will take several months to finish
D．they expect to keep oil prices steady with lower demand in April
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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