题目

阅读理解In 1939, seven-year-oldMariam Schreiber should have started first grade. Instead, she spent that year— and the following five — trying to survive. She was living in Poland whenWorld War II broke out. My entire life was ruined within minutes,she says. I was looking forward to starting school. She never madeit. And not having a degree has always been a thorn in her side.Decades later, though, thenow-89-year-old Holocaust survivor finally got something she had always longedfor. Kapiloff Brander, director of community programs at Jewish FamilyServices, reached out to the New Englan下列实验操作中错误的是( )A. 蒸发结晶B. 检查气密性C. 滴管用后不洗涤直接插回原瓶D. 塞紧橡皮塞 D 【解析】 A．蒸发结晶时，要用玻璃棒不断搅拌，防止液滴飞溅，此选项正确； B．检查气密性，一般用手捂法：将导管口放到水中，两手捂住容器外壁，观察导管口有无气泡冒出，若松开水，导管口会形成一段水柱，说明装置气密性良好。此选项真正确； C．滴瓶上的滴管，只用来滴加一种液体，所以用后不洗涤。此选项正确； D．连接试管与橡皮塞时，左手拿试管，右手拿橡皮塞先沾一下水，再旋转...