$2 \cdot 92$ The number of real roots of the equation $x^{2}+|x|+1=0$ is
(A) 4.
(B) 2.
(C) 1.
(D) 0.
(2nd "Hope Cup" National Mathematics Invitational Competition, 1991)
[Solution] Since $x^{2} \geqslant 0, |x| \geqslant 0$, then $x^{2}+|x|+1>0$. $\therefore$ The equation has no real roots.
Therefore, the correct choice is $(D)$.