如果甲数比乙数大20%，乙数比甲数少a，那么乙数是______．
a÷20%=5a．
答：乙数是5a．
故答案为：5a．
Mrs. Green wants to buy that kind of cloth because she _____ that the cloth _____ very well. [ ]
A. has been told; washes
C. is told; washes
B. has been told; is washed
D. is told; is washed
常用的反映失业程度的两项指标是失业率和失业（）。
A.稳定期
B.持续期
C.波动期
D.变化期
