已知x,y满足不等式组{y≤xx+y≥2x≤2,则z=2x+y的最大值除以最小值等于( )
人类活动方式可取的是在内蒙古草原上垦荒种粮。
——We like Zhang Lili, the most beautiful teacher .——Yes, she is ____________ popular with her students.