如果一元二次方程x²+12x+27=0的两个根是x₁，x₂，那么x₁+x₂的值为[ ]

A.-6

B.-12

C.12

D.27

Most of our fears are unreasonable, but we find ______.

A．it impossible to erase them

B．that they can not erase

C．them to erase impossible

D．erasing them impossible