A:{2}
B:{2,3}
C:{1,,3 }
D:{1,2,3,4,5}
食盐加碘的目的是防止 ( )
用二分法求函数y=f(x)在区间2,4上零点的近似解,经验证有f(2)•f(4)<0.若给定精确度ε=0.01,取区间的中点 ,计算得f(2)•f(x1)<0,则此时零点x0∈____.(填区间)
In order to ____, he ____ give her a big surprise on Sunday.