60×12÷13，
=30÷13，
=90，
答：乙数是90，
故答案为：90．
—Is your stomachache getting ________?
—No, it's worse. [ ]
A. better
B. bad
C. less
D. well
（）声明了投保人购买保险的意图。
A.投保单
B.保险单
C.暂保单
D.保险凭证
