题目

Depend on yourself. Parents can help you. Teachers can help you. But all these only help you to help yourself. There have been many great men in history. But many of them were very poor when they were young, and had no uncles, aunts or friends to help them. Schools were few and not very good. They could not depend upon them for education. They saw how it was, and set to work with all their strength to know something. They worked their own way till they became well-known. One of the most famous teachers in England used to tell his pupils, “I cannot make worthy men of you, but I can help make 下列实际应用中，利用中和反应原理的是 [     ]A．用稀硫酸除铁锈B．用熟石灰改良酸性土壤C．实验室用石灰石和稀盐酸制取CO2D．用生石灰作食品干燥剂