问题
单项选择题
含氯消毒剂溶于水产生以下哪一种成分起杀菌作用
A．次氯酸根
B．氯离子
C．亚氯酸根
D．次氯酸
E．氯气
答案
参考答案：D
解析：氯的杀菌作用机制是由于次氯酸体积小，电荷中性，易于穿过细胞壁；同时，它又是一种强氧化剂，能损害细胞膜，使蛋白质、RAN、DNA等物质释放，并影响多种酶系统，从而使细菌死亡。氯对病毒的作用，在于对核酸的致死性损害。
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含氯消毒剂溶于水产生以下哪一种成分起杀菌作用
A．次氯酸根
B．氯离子
C．亚氯酸根
D．次氯酸
E．氯气
参考答案：D
解析：氯的杀菌作用机制是由于次氯酸体积小，电荷中性，易于穿过细胞壁；同时，它又是一种强氧化剂，能损害细胞膜，使蛋白质、RAN、DNA等物质释放，并影响多种酶系统，从而使细菌死亡。氯对病毒的作用，在于对核酸的致死性损害。
One Saturday afternoon, Kate went to buy something for her sister and herself. As Kate was coming out of a 1, a young lady walked towards her. She said she was Miss Green --- a good friend of Kate’s sister. Kate 2 her. Then she called a taxi to send Kate home. She 3 the driver where he should go. Kate was 4 that it was not the in direction of her home. “ 5?” Kate asked. The lady smiled. When they came to a quiet road, a big rough man 6, on the road. He stopped the taxi driver, knocked him down, and threw him out of the 7. At the same time, Miss Green took out of a knife and 8 it at Kate. She asked Kate to keep 9. The man then started the taxi. “ Oh, my God! I’m being kidnapped,” Kate said to herself. She tried to escape, but not 10. Suddenly an 11 came to her. She took out a lipstick(口红) from her pocket, wrote ‘SOS’ on the window, and covered the word with her 12. A few minutes later, a police car 13 and the policemen saw the sign. When the kidnappers saw the policemen they stopped the taxi, jumped into the grass, and ran away. The policemen then 14 Kate up and sent her home. When her parents knew what had happened, they were greatly surprised. But they were also 15 because their daughter had finally come back safely.
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