单项选择题

The underlined word "charges" in the last paragraph means______.

A．cost for goods and services
B．work given as a duty
C．money in small unit
D．students' attack at high speed
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单项选择题
To communicate with friends, nearly half of the college students use ______.
A．telegraphs
B．telephones
C．emails
D．letters
单项选择题
From the third paragraph we can find that in the US ______.
A．cell phones will take the place of computers in colleges
B．college students can have a computer from their colleges
C．most college students are from rich families
D．mobile phones make Internet life easy for college students
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