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51.________.

What should be taught to students according to paragraph 3 ?

• A、How to do research on the Internet.

• B、How to pay attention to their studies.

• C、Ways to improve their research habits.

• D、Skills to judge the quality of the information.

What does striking in the fourth paragraph most probably mean?

• A、Easy to notice.

• B、Difficult to accept.

• C、Interesting to read.

• D、Impossible to remember.