18．聽第11段材料，回答第11至12小題．聽之前你有5秒鐘時間閱讀相關(guān)小題，聽完后你有5秒鐘時間作答． 11．When does this conversation happen？ A．In the morning． B．In the evening． C．At night． 12．What did they have for supper yesterday？ A．Sandwiches． B．Bread． C．Chinese food．
10．聽第12段材料，回答第13至15小題．聽之前你有5秒鐘時間閱讀相關(guān)小題，聽完后你有5 秒鐘時間作答． 13．Why do they collect the rubbish along the river？ A．To stop the river from being polluted． B．To sell it for money． C．To see the river every day． 14．How many volunteers do they have？ A.10． B.14． C.24． 15．When do they do the volunteer work？ A．At 8：30 every morning． B．After lunch at noon． C．After dinner every evening．
