单项选择题

But cellphones had been around for 15 years before they caught on with() America. By that yardstick, broadband-widely available for only the past couple of years-has many more miles to go.

A. main-topmast
B. mainstay
C. main artery
D. mainstream

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C
单项选择题
The government recently presented an ambitious plan to tackle the violence and ()that follow when too many people drink too much too quickly in too small an area.

A. alienation
B. delimitation
C. bareness
D. mayhem
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