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

This passage might be subtracted from

A．a book preface
B．a scientific magazine
C．a physical paper
D．an investigation report

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