题目内容：

Facebook is the world’s biggest social networking site. People are being tricked into Facebook with the promise of a fun, free service without realizing they’re paying for it by giving up loads of personal information.

Most Facebook users don’t realize this is happening. Even if they know what the company is up to, they still have no idea what they’re paying for Facebook because people don’t really know what their personal data is worth.

The biggest problem, however, is that the company keeps changing the rules. Early you could keep everything private. That was the great thing about Facebook— You could create your own little private network. Last year, the company changed its privacy rules so that many things— your city, your photo, your friends’ names— were set  by default (默认)to be shared with everyone on the Internet.

According to Facebook’s vice-president Elliot Schrage, the company is simply making changes to improve its service, and if people don’t share information, they have a “less satisfying experience”.

Some critics(批评家) think this is more about Facebook looking to make more money. In original business model, which involved selling ads and putting them in the side of the pages totally, who wants to look at ads when they’re online connecting with their friends?

The privacy issue has already landed Facebook in hot water in Washington. In April，Senator Charles Schumer called on Facebook to change its privacy policy. He also urged(催促) the Federal Trade Commission to set guidelines for social networking sites. “I think the senator rightly communicated that we had not been clear about what the new products were and how people could choose to use them or not to use them,” Schrage admits.

I suspect that whatever Facebook has done so far to invade our privacy, it’s only the beginning，which is why I’m considering cancelling(取消)my account.Facebook is a handy site, but I’m upset by the idea that my information is in the hands of people I don’t know. That’s too high a price to pay.

1.What do we learn about Facebook from the first paragraph?

A. It is a website that sends messages to users who want to get married.

B. It makes money by selling its users’ personal data.

C. It provides loads of personal information to its users.

D. It earns money by putting on advertisements.

2.What does the author say about most Facebook users?

A. They are unwilling to give up their personal information.

B. They care very little about their personal information.

C. They don’t identify themselves when using the website.

D. They don’t know their personal data enriches Facebook.

3.Why does Facebook make changes to its rules according to Elliot Schrage?

A. To obey the Federal guidelines.

B. To provide better service to its users.

C. To improve its users’ connection

D. To expand its business.

4.Why does the author plan to cancel his Facebook account?

A. He is dissatisfied with its present service.

B. He finds many of its users untrustworthy.

C. He doesn’t want his personal data badly used.

D. He is upset by its frequent rule changes.