问题
单项选择题
致石棉肺的物质是
A．石棉
B．二氧化硅
C．铅
D．汞
E．二氧化碳
答案
参考答案：A
解析：游离SiO2粉尘，俗称硅尘，在生产中长期吸入此类粉尘，引起的肺纤维化为主的全身性疾病，称矽肺。而石棉肺是在生产过程中长期吸入石棉粉纤维所引起的以肺纤维化为主的全身性疾病。
搜题请搜索小程序“爱下问搜题”
致石棉肺的物质是
A．石棉
B．二氧化硅
C．铅
D．汞
E．二氧化碳
参考答案：A
解析：游离SiO2粉尘，俗称硅尘，在生产中长期吸入此类粉尘，引起的肺纤维化为主的全身性疾病，称矽肺。而石棉肺是在生产过程中长期吸入石棉粉纤维所引起的以肺纤维化为主的全身性疾病。
When I was young，my father told me that little acts of kindness may give one great happiness. Since then I have always tried to help people in 1 . One hot summer afternoon, I was 2 down the highway to New York when another car suddenly 3 into my lane(车道). My car was in the far right lane，so it ran onto the roadside. As a(n) 4 driver，I moved my car quickly and skillfully back onto the highway without causing any accident. I was 5 with that driver，but I thought that he just did not pay attention to（注意） the lane change, and he 6 did not do that on purpose(故意).The car ran away 7 after cutting me off. Very soon it disappeared from sight. After a while，I came around a curve(弯道) and found the 8 car. The driver was walking along the roadside. He was an elderly man and looked 9 . As there was no telephone nearby and the nearest services were twenty miles away, I decided to 10 and see what the problem was. The man’s car had a flat tire(瘪胎). Although he had another tire，he had nothing to work with. I decided to 11 him. I changed the tire for him and allowed him to sit in my air-conditioned car while I did it. Fifteen minutes later，I 12 the work. I was hot and tired，but I really felt 13 after an act of kindness to the man who had earlier 14 my car run off the road. You can really enjoy great 15 from kindness acts, so always lend your hands to others in trouble.
|