题目

为确定某溶液的离子组成，进行如下实验：①测定溶液的pH，溶液显强碱性；②取少量溶液加入稀盐酸至溶液呈酸性，产生无刺激性气味且能使澄清石灰水变浑浊的气体；③在②中溶液中再滴加Ba(NO3)2溶液，产生白色沉淀；④取③中上层清液继续滴加Ba(NO3)2溶液至无沉淀时，再滴加AgNO3溶液，产生白色沉淀。根据实验现象，以下推测正确的是( ) A．一定有SO B．一定有CO C．一定有Cl－ D．不能确定HCO是否存在A Big UmbrellaNancy: I saw seven girls in one umbrella and none of them got wet.Taney: Oh, that must be a very big umbrella.Nancy: No, it wasn’t raining.A Good BoyLittle Robert asked his mother for two cents.“What did you do with the money I gave you yesterday?”“I gave it to a poor old woman,” he said.“You’re a good boy,” said the mother proudly. “Here are two more cents. But why are you so interested in the old woman?”“She is the one who sells candies.”Break a Mirror（镜子）“Why are you so happy, Jason?” Laura asked the 98-year-old man.“I broke a mirror,” he replied.“But that means seven years of bad luck.”“I know,” he said happily. “Isn’t it wonderful? I can live for another seven years.”根据短文内容，选择正确答案。1.The three passages above are all .A. jokes B. noticesC. news D. letters2.The seven girls didn’t get wet because .A. the umbrella was big enoughB. the seven girls wore their raincoatsC. it wasn’ t raining at allD. it wasn’t a heavy rain3.Little Robert spent the money .A. helping the poor old ladyB. buying candies for himselfC. helping his momD. buying gifts for his mom4. broke the mirror.A. Nancy B. Laura C. Robert D. Jason5.Which of the following is true?A. Robert’s mother was very kind.B. Little Robert would get four cents every day.C. Because of breaking the mirror, Jason lived to be 105 years old.D. Laura would often break a mirror after hearing Jason’s words.