题目

听长对话，回答问题。 （1） What is the relationship between the two speakers? A . Mother and son. B . Teacher and student. C . Doctor and patient （2） How long does the pain last? A . For about one week. B . For about two weeks. C . For about three weeks. （3） What does the woman suggest the man do in the end? A . Take some medicine. B . Have an examination. C . Come again tomorrow.将少量固体分别投入到盛少量水的烧杯中，再滴入酚酞，溶液不会变为红色的是A. Na B. Na2O C. NaOH D. NaCl