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．boost
B．boom
C．production
D．prosperity

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单项选择题
These continual （）in temperature make it impossible to decide what to wear.

A．transitions
B．transformations
C．exchanges
D．fluctuations
单项选择题
In mountainous regions, much of the snow that falls is （）into ice.

A．dispersed
B．embodied
C．compiled
D．compacted
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