1909年全线通车的京张铁路，是中国人自行设计和施工的第一条铁路干线。担任这条铁路建设的总工程师是：
A．曾国藩
B．詹天佑
C．张骞
D．李鸿章
答案：B
詹天佑（1861年3月17日—1919年4月24日），字眷诚，号达朝，英文名Jeme Tien Yow，中国近代铁路工程专家。汉族，原籍安徽婺源（今属江西），生于广东南海。12岁留学美国土木工程及铁路专科，大学毕业获学士学位归国；1905—1909年主持修建我国自建的第一条铁路—京张铁路；创造"竖井施工法"和"人"字形线路，震惊中外；在筹划修建沪嘉、洛潼、津芦、锦州、萍醴、新易、潮汕、粤汉等铁路中，成绩斐然。著有《铁路名词表》、《京张铁路工程纪略》等；有“中国铁路之父”“中国近代工程之父”之称。
Anger is good for you, as long as you control it, according to new psychology research. A new study from Carnegie Mellon University shows anger may help people reduce the negative impacts of stress and help you become healthier. “Here getting emotional is not bad for you if you look at the case of anger,” said Jennifer Lerner of Carnegie Mellon. “The more people display anger, the lower their stress responses.” Lerner studied 92 UCLA students by asking them to count back from 6,200. They must say out loud every thirteenth number. Researchers disturbed them by asking them to count faster or ask them other questions. If they made any mistakes, they had to restart from the very beginning. Many students felt depressed about making so many mistakes or got angry. Lerner used a hidden video camera and recorded all their facial expressions during the test. The researchers describe their reactions as fear, anger and disgust. Other researchers recorded the students’ blood pressure, pulse and production of a high-stress hormone（荷尔蒙）called cortisol. People whose faces showed more fear during the experiment had higher blood pressure and higher levels of the hormone. Both can have lasting effects such as diabetes（糖尿病）, heart disease, depression and extra weight gain. When people feel fear, negative impacts increase, but when they get angry, those negatives go down, according to the study. “Having that sense of anger leads people to actually feel some power in what otherwise is a maddening（令人发狂的）situation,” Lerner said. Lerner previously studied Americans’ emotional response to the 9/11 terrorist attacks two months after the incident. She found people who reacted with anger were more optimistic. These people are healthier compared with those who were frightened during the event. So in maddening situations, anger is not a bad thing to have. It’s a healthier response than fear. 小题1: What is the story mainly about?
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