程序代码如下：

age=float(input(“请输入年龄=”))

HRrest=float(input(“请输入安静心率=”))

gender=input(“请输入male或female:”)

               

    n=220

else:

    n=210

    low=(n-age-HRrest)*0.6+HRrest

    high=(n-age-HRrest)*0.8+HRrest

print(“最适宜运动心率是:”,low,“~”,high)

横线上应填入的内容是(  )

A、if gender=male:

B、if male==gender:

C、if gender==male:

D、if gender==“male”: