A：to
B：on
C：by
D：of
成蛙的呼吸器官是（ ）
某日晨7时36分，北京天安门广场举行了隆重的升旗仪式（日出时举行）．据此回答下题．
— Which of the two magazines will you buy?
— I will take _______. ______ are useless to me.
