In the Xuzhou survey ,how many children have extra private lessons

A．The Internet provides us with perfect educational information.
B．The Internet provides us with limitless resources.
C．We can obtain the latest information from foreign countries through the Internet.
D．The information on the Internet is no longer available only for a few people.

A．The online information for school teaching.
B．Some problems of the Internet use.
C．Who is responsible for the Internet safety.
D．How to evaluate the online resources.