According to Paragraph 2, which of the following may lead to insomnia?

• A、Reading a book for relaxation before bedtime.

• B、Lowering lights one hour before bedtime.

• C、Drinking some warm milk before bedtime.

• D、 Listening to rock music before bedtime.

What is true about today' s communication through social media?

• A、It causes more health risks.

• B、It gives litle communication context.

• C、It leads to better relationships.

• D、It improves the quality of interaction.

57.（）