单项选择题

The post-World War Ⅱ baby （）resulted in a 43 percent increase in the number of teenagers in the 1960s and 1970s.

A. bomb
B. boom
C. production
D. prosperity

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单项选择题

The European Union countries were once worried that they would not have supplies of petroleum（）

A. pure
B. efficient
C. potential
D. sufficient

单项选择题

If （） and lodging are included in educational fees, a university student in the U.S. will need approximately $10,000 a year.

A. meal
B. board
C. food
D. provisions

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