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
College students in US, as this passage shows,______.
A．waste much time visiting the Internet
B．spend too much time visiting the Internet
C．lead an exciting life by using the Internet
D．don't have to learn their lessons in the classrooms
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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