B 【解析】当铁粉消耗完后,继续加入稀硫酸,所消耗铁粉的质量将不再增加,A不成立;铁与稀硫酸反应生成硫酸亚铁和氢气,随着所加稀硫酸质量的增加,生成硫酸亚铁和氢气的质量由零开始逐渐增多,直到铁粉消耗完不再变化,B成立、C不成立;反应停止后,随着所加稀硫酸质量的增加,溶液的质量持续增多,D不成立。故选B。
It was with great delight that I read in your February _____ the letter to the Editor written by Prof. Johnson. A. issue B. printing C. magazine D. copy
Two weeks later, volunteers took part in a memory test. In the test, they 33____ (show) a series of words related to the situations they’d read about and were asked to recall certain ones and forg