D．some antibiotics are given to both cattle and people

　　解析：选D　细节理解题。根据第三段的最后一句可知，为了不让牛生病，给牛用了抗生素，这些抗生素与用在人身上的抗生素相似，所以当人生病的时候，药力就减弱了。故选D项。

　　4．We can infer from the text that ________.

　　A．food from local farms can help add to the variety in our daily meals

　　B．soy or grains are on the list of traditional diets of the cattle

　　C．corn for the cattle leads the meat to lower in both fat and calories

　　D．lower temperature makes grass­fed beef more delicious

　　解析：选A　推理判断题。根据第一段第一句中的“more locally­farmed protein choices are available to help ... they originated”可推知A项正确。

　　B

　　(2017·福州质检)If you see a group of people dancing and singing on the street or in the railway station, you don't need to feel surprised. They are a flash mob (暴民). Who are they? Are they mobs? Don't be confused by their name. Actually, a flash mob is a group of people who gather suddenly in a public place, do something unusual for a brief period of time, and then quickly disappear.

　　They are usually organized with the help of the Internet or other digital communications networks. The messages may be sent to friends, who send to more people. At a pre­determined time, they gather and perform some activities such as exchanging books, coming together to look at the sky, waving their hands and yelling something at the top of their voice for 30 seconds. Then, they quickly disappear before the police can arrive. Using mobile phones, the flash mobs can change its place if the first one has been cancelled for any reason.

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