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51.________.

What will happen when students depend too much on research tools ?

• A、They won’t make good use of books.

• B、They don’t copy work done by others.

• C、Their studies will be greatly improved.

• D、Their attention to things will last longer.

What does the text mainly discuss about the Internet?

• A、Its influence on school teachers.

• B、Its effect on high school students.

• C、Its success in high school teaching.

• D、Its achievements in school research.