题目

The best way of learning a language is by using it. The best way of learning English is talking in English as much as possible. Sometimes you will get your words mixed up and people will not understand you. Sometimes people will say things too quickly and you can’t understand them. But if you keep your sense of humor you can always have a good laugh at the mistakes. Don’t be unhappy if people seem to be laughing at your mistakes. It is much better for people to be laughing at your mistakes than to be angry because they don’t understand what you are saying. The most important rule for lea 有5种物质：①石灰水，②石灰石，③红热的碳，④水，⑤食盐水，其中能吸收CO2并反应放出另外一种气体的是 A． ①④ B． ②⑤ C． 只有③ D． 只有①