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 advertisement says this material doesn't ______ in the wash, but it has.
A．contract
B．shrink
C．slash
D．dissolve
单项选择题
They came to their rescue and convinced these trembling men ______ safety and help.
A．of
B．with
C．for
D．as
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