What will be difficult when the son attends graduate school?

• A、He will not call his mom so often.

• B、He will not give his mom any gift.

• C、He will spend holidays at home.

• D、He will be far away from home.

53.________.

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.