15．21．When did David receive a few Christmas cards？ A．On December 20th． B．On December 23rd． C．On December 25th． 22．How many cards would David buy？ A．Ten． B．Eleven． C．Twelve． 23．Who was Miss White？ A．David's good friend． B．David's sister． C．David's teacher． 24．Where did David go after he finished writing"Merry Christmas!"on those cards？ A．A post office． B．Another shop． C．His home． 25．What did David write on every card？ A．Happy New Year! B．Merry Christmas! C．Good luck to you!
16．请听第四段对话，回答第9至第10两个小题． 9．What's the man's opinion about the life in the future？ A．There will be more pollution． B．There will be less pollution． C．There will be no pollution． 10．What are causing more environment problems according to the woman？ A．People's activities． B．Animals'activities． C．Fewer plants．
