1 . Just reading Facebook posts——without posting messages or responding to comments——makes users feel bad about themselves，some studies have discovered. A 2015 study at the University of Michigan，for example，found that students who simply read Facebook posts for 10 minutes were in a worse mood by the end of the day than those who posted messages or commented on friends' posts.

Researchers think that users who only read posts may be always comparing their own lives to others' posts and feel they're coming up short. Or users may simply be missing out on face-to-face human communication.This is necessary and important for a healthier state of mind. "In general，when people spend a lot of time passively（被动地）receiving information——reading，but not interacting（交流）with people——they report feeling worse afterward，"said an unusual Facebook blog post.

The research appears to be bad news for Facebook，but Facebook itself is getting the negative news known to the public. In fact，the findings support the company's push to get users to be more active on the site，the blog noted. Research has also found that “interacting with people—especially sharing message，posts and comments with close friends and thinking of past interactions — is connected with improvements in well-being".

One commenter to the Facebook blog post noted that it's "no surprise that your conclusions-encouraging 'active' Facebook use—are connected with Facebook's business interests. It gives Facebook chances to persuade us into sharing, commenting, and posting more than ever—for our own good!"

The company has faced a lot of negative news about Facebook. Former Facebook Vice President Chamath Palihapitiya told Stanford University graduate business students that social media are destroying society. Palihapitiya said he felt really bad for the role he played in making Facebook so outstanding."We kind of knew something bad could happen."

1. What did the 2015 study mainly show?

A．Not all users considered Facebook useful.

B．Using Facebook in the right way could benefit us.

C．Not all people loved interacting with others on Facebook.

D．Passively using Facebook negatively affected users' moods.

2. What does the underlined word "This"in Paragraph 2 refer to?

A．Avoiding comparing ourselves with others.

B．Reading the posts on Facebook positively.

C．Interacting with others face to face.

D．Sharing experiences on Facebook.

3. Why did Facebook make the findings known to the public?

A．To encourage people to use Facebook more.

B．To show Facebook's concern about its users.

C．To apologize to its users for the bad influence.

D．To prove the importance of human interaction.

4. From what Chamath Palihapitiya said, we learn that       .

A．Facebook has some disadvantages

B．Facebook is facing serious challenges

C．Facebook disappoints the public deeply

D．Facebook is improving some students' life