单项选择题

Immediate solution should be （）to save the people from the flood that has swept southern China this summer.

A. called at
B. called for
C. called on
D. called in

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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
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
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