63. What challenges teenagers?

　　A. Giving natural response.

　　B. Making logical decision.

　　C. Acting before thorough thinking.

　　D. Choosing brain-training strategies.

　　64. An impulsive person tends to __________.

　　A. think through a risk in advance

　　B. show high level of self-control

　　C. consider or accept new ideas

　　D. change ideas frequently

　　65. According to the passage, by training one’s brain, one can __________.

　　A. stop taking risks

　　B. fully develop one’s brain

　　C. become more open to new experience

　　D. reduce the influence of emotional drive

　　66. What is the best title for the passage?

　　A. Discover the Brain Function

　　B. Crying Over the Spilt Milk

　　C. Push the Pause Button

　　D. Impulsivity Works

　　D

　　Fencing or Not

　　Wildlife fences are constructed for a variety of reasons including to prevent the spread of diseases, to protect wildlife from poachers（偷猎者）, and to help manage small populations of threatened species. Human-wildlife conflict is another common reason for building fences. Wildlife can damage valuable farm animals and crops. Some species carry diseases of agricultural concern, and a few threaten human lives. At the same time, people kill wild animals for food, trade, or to defend lives or property, and human activities destroy wildlife habitat（栖息地）. Separating people and wildlife by fencing can appear to be a mutually beneficial way to avoid such harmful effects. But in a paper in the journal Science, published recently, some scientists argue that fencing should only be used if worse comes to worst.

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