3.听第11段材料,回答11-12题. 11.Why was the mother worried? A.Her son met something trouble in school. B.Her son didn't get home from school as usual. C.Her husband didn't say something about her son. 12.When will their son come back? A.At 5:00 p.m. B.At 6:00 p.m. C.At 7:00 p.m.