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An African-American man named John Henry was the hero of former slaves and the people who built the railroads in the US in the 19th century. John Henry was born a slave. He was known for his strength. Many people say he represents the spirit of growth in America during that period. John Henry grew up in a world that did not let children stay children for long . Before he was six years old, he was carrying stones for workers building a nearby railroad. By the time John Henry was a young man, he was one of the best railroad workers in the country. John Henry was asked to lead workers on a hard project, creating a tunnel through a mountain. The project required about 1,000 laborers and lasted three years. Hundreds of men became sick as a result of the hot weather and tiredness. John Henry was the strongest and fastest man. Concerned his friends might lose their jobs, he picked up their hammers and began doing their work. He worked day and night, rarely stopping to have a rest. One day, a salesman came to the work area with a new drilling machine powered by steam. He said it could drill holes faster than twelve men working together. John Henry looked at the machine and saw images of the future. He saw machines taking the place of America’s best laborers. He saw himself and his friends unemployed and sanding by a road, asking for food. He decided he would never let the machine take their jobs. Therefore, a competition between a man and a machine began .At first, the steam-powered drill worked twice faster. Then, John Henry started working with a hammer in each hand. He worked faster and faster. People cheered when the machine broke down and was pulled away. But they were sad to find John Henry fall to the ground, with blood spilling all around, and still holding a hammer in one of his hands.“I beat them,”he said. Then he took his last breath. 小题1:What does the underlined part in Paragraph 3 most probably mean? A.Many children in those days starved to death. B.Children at that time grew much faster. C.Children in those days had to work like adults. D.Children at that time couldn’t stay together. 小题2:Why did hundreds of workers become sick? A.Because they had to work long hours. B.Because the weather was hot and they were tired. C.Because the project was too hard. D.Because they didn’t have time to eat. 小题3:John Henry helped do his friends’ work . A.because he was the strongest and fastest man B.for fear that his friends would lose their jobs C.so that they could regain their strength D.in order be the hero of the railroad workers 小题4:Which of the following best describes John Henry? A.Kind and determined. B.Cautious and considerate. C.Brave and strict. D.Hardworking and stubborn.
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举一反三
【单选题】增色效应指的是 答( )
A.
①受热时, DNA 溶液旋光色散 (ORD) 改变
B.
②双链 DNA 最大变性速率所对应的温度;
C.
③变性 DNA   OD 260 值增高;
D.
④ DNA - RNA 杂合体退火时 OD 260 值升高。
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A.
阻断 M 1 胆碱受体,减少胃酸分泌
B.
抑制胃壁细胞 H + 泵,减少胃酸分泌
C.
阻断胃泌素受体,减少胃酸分泌
D.
阻断 H 2 受体,减少胃酸分泌
E.
抑制幽门螺杆菌
【简答题】简述汽轮机为何采用蒸汽中间再热。
【简答题】简述运动疗法的治疗作用和临床应用。
【简答题】简述运动疗法的治疗作用。
【单选题】以下四项中,哪一项不属于网络信息安全的防范措施:( ) 。
A.
身份验证
B.
跟踪访问者
C.
设置访问权限
D.
安装防火墙
【单选题】雷尼替丁抗消化性溃疡的机制是
A.
中和胃酸,减少对溃疡面的刺激
B.
抑制中枢的兴奋作用
C.
抗胆碱能神经
D.
阻断胃壁细胞的H\r\n 2 \r\n体
E.
抑制H\r\n + \r\n-K\r\n + \r\n-ATP酶活性
【单选题】以下四项中,( )不属于网络信息安全的防范措施
A.
身份验证
B.
查看访问者的身份证
C.
设置访问权限
D.
安装防火墙
【单选题】以下四项中,()不属于网络信息安全的防范措施。
A.
身份验证
B.
跟踪访问者
C.
设置访问权限
D.
安装防火墙
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