单项选择题

Bats are long-lived creatures, _____a life-expectancy of around 20 years.

A．Asome have
B．some having
C．some of them have
D．some of which having
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单项选择题
The customs officer（）him open his three suitcases.

A．forced
B．made
C．asked
D．urged
单项选择题
Which decade sees the sharpest increase in population between 65-74（）

A．2010s
B．1990s
C．2000s
D．1980s
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