问题
单项选择题
某汞作业环境不同采样点汞浓度与患病调查为：0.08mg／m3，患病率7.0％；0.16mg／m3，患病率17.0％；0.24mg／m3，患病率28.0％。应采取主要的预防措施是（）。
A.建立劳动卫生制度
B.培养良好卫生习惯
C.控制污染源
D.做好就业体检
E.定期体检
答案
参考答案：C
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某汞作业环境不同采样点汞浓度与患病调查为：0.08mg／m3，患病率7.0％；0.16mg／m3，患病率17.0％；0.24mg／m3，患病率28.0％。应采取主要的预防措施是（）。
A.建立劳动卫生制度
B.培养良好卫生习惯
C.控制污染源
D.做好就业体检
E.定期体检
参考答案：C
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| Thomas Edison was a famous American scientist. He was l in 1847. When he was a child, he liked to 2 out how things worked. He was in school 3 only three months. He asked his teacher a lot of strange questions. Most of them had nothing 4 his lessons. The teacher thought the boy was not bright. So Edison's mother took her son 5 of school. As his mother had been a teacher, she taught Edison 6 .The boy read a 7 .Soon he became very 8 in science. At the age of ten, Edison had already 9 a chemistry lab for himself. When he grew into a young man, he 10 many important things for man. All these things have changed the whole world. Can you name some of his inventions? | ||||
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