91÷13=7，
答：爷爷的年龄是小丽的7倍．
故选：C．
希望小学今年有毕业生240人，比去年毕业的增加20%，去年毕业的学生有多少人？
The( )will be issued by China Import & Export Commodity Inspection Bureau or by any of its branches．
A．certificationB．certificateC．certifyD．certificated
