B. By telephone.

　　C. By letter.

　　D. By fax.

　　28. Which can be the best title for the text?

　　A. Volunteers First Explore Mars

　　B. Volunteers Experience Life in Hawaii

　　C. Volunteers Get Taste of Mars in Hawaii

　　D. Volunteers Study the Environment on Mars

　　C

　　People are being attracted to Facebook with the promise of a fun, free service without realizing they’re paying for it by giving up large amounts of personal information. Facebook then attempts to make money by selling their data to advertisers that want to send targeted messages.

　　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 information is worth.

　　The biggest problem, however, is that the company keeps changing the rules. Early on, you 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”.

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