题干

哺乳动物是最高等的一类动物,有很强的生存能力,下面相关述错误的是(    )

A:胎生、哺乳提高了哺乳动物后代的成活率

B:牙齿有门齿、犬齿和臼齿的分化,提高了哺乳动物摄取食物的能力

C:高度发达的神经系统和感觉器官,能对环境的复杂多变及时作出反应

D:不断变化的体温,增强了对环境的适应能力,扩大了分布范围

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D

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    People are being lured(引诱) onto 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 data 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”.

    Some critics think this is more about Facebook looking to make more money. Its original business model, which involved selling ads and putting them at the side of the page, totally failed. 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(议员) Charles Schumer called on Facebook to change its privacy policy. He also urged the Federal Trade Commission to set principles 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 is only the beginning, which is why I'm considering deactivating (撤销) 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.