问题
单项选择题
为了确保人身安全，设置安全栅网以屏蔽（）电流。
A、感应
B、高压引起的
C、直流
D、交流
答案
参考答案：A
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为了确保人身安全，设置安全栅网以屏蔽（）电流。
A、感应
B、高压引起的
C、直流
D、交流
参考答案：A
How far would you walk to learn about something that interested you? When he was young, Jacob Lawrence often walked more than sixty from his home in the Harlem section of New York City to the Metropolitan Museum of Art．Jacob wanted to be a（n） ，and he believed that studying the famous paintings in that museum would help him． It was 1930,when many people were out of work, money was and people suffered a lot．Still the streets were with energy and color．As he walked through Harlem, Jacob looked hard at the people, the churches, and barbershops and so on．He those images in his mind, along with the images of paintings he saw in the ． Jacob came from a poor family．His mother believed there was little chance her son could grow up to be a successful painter．She wanted him to aim for something more ．But Jacob's teacher, Alston, in an art program saw that he was talented．Alston him how to use paints to make stage sets． As time passed, Alston let Jacob rent work space in his own studio． That was an exciting place for a young black man to become an artist．Many creative people there to talk about art, literature and history．From their ,Jacob learned that history books often the accomplishments of African Americans．He decided to paint a sel1es of pictures describing the story of a black hero．He Toussaint, who had helped free his people French ruling． Many people admired Jacob's pictures, but he needed admiration．To help his family, he often had to work at jobs that him away from painting．Then something encouraging happened．An artist named Augusta got Jacob a job．For eighteen months, Jacob was given a to paint pictures． For the first time, he felt like a artist．
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以下每道试题有2～6个提问，每个提问有5个备选答案，请选择1个最佳答案。
| 患者，女，58岁，10年前健康体检时，被告知“心电图异常”，近2个月来，“眼前一阵发黑”3次。来院后查：P42/min，规整，BP 134/80mmHg，心电图(图10)。
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依据其心电图诊断为（）
A．二度Ⅰ型房室传导阻滞
B．二度Ⅱ型房室传导阻滞
C．窦房传导阻滞
D．窦性心动过缓伴室性停搏
E．完全性房室传导阻滞
