题目

根据短文内容回答问题 It was very cold. It snowed heavily and blew very strongly. It was not a good night to go out. But David had to walk home from work “I can be warmer,” he thought, “I wear my coat backwards①.”He took off his coat and put it on backwards. “That’s much better.”He thought and walked on. About ten minutes later a car hit him. The driver stopped his car and got out of it. He ran to help David. Soon a police car arrived. The policeman ran to look at David. “I’m afraid he’s dead.”The policeman told the driver. The driver could not believe it.下列各组溶液，不加其他试剂就能鉴别的是（ ）A．Na2CO3、H2SO4、HCl、NaNO3B．NaOH、NaCl、MgCl2、FeCl3C．HCl、AgNO3、HNO3、MgCl2D．K2SO4、Na2CO3、BaCl2、HNO3