原式=(x+2+x-2)(x+2-x+2)x
=2x×4x
=8．
He wrote a lot of novels，none of________was translated into a foreign language.
A．them
B．what
C．that
D．which
岗位资格培训包括：岗前培训、上岗培训、转岗培训、在岗培训。（）
