12÷20=1525=35=3660=60%=六折.
故答案为:20,15,60,60,六.
I need a bike __________ to school.
A.go
B.goes
C.going
D.to go
咯血最常见于
A.流行性出血热
B.肺出血型钩端螺旋体病
C.支气管子宫内膜异位
D.白血病
E.肺结核