【单选题】What is mainly discussed in the text
A．The on line information for school teaching.
B．Some problems of the Internet use.
C．Who is responsible for the Internet safety.
D．How to evaluate the on-line resources.
【单选题】What is mainly discussed in the text
A．The on line information for school teaching.
B．Some problems of the Internet use.
C．Who is responsible for the Internet safety.
D．How to evaluate the on-line resources.
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