—The authors of computer viruses are geniuses.

—I agree，they can apply their wisdom to other net technology________human beings can benefit.                                                                

有甲、乙两位同学，根据“关于x的一元二次方程kx²﹣（k+2）x+2=0”（k为实数）这一已知条件，他们各自提出了一个问题考查对方，问题如下：

甲：你能不解方程判断方程实数根的情况吗？

乙：若方程有两个不相等的正整数根，你知道整数k的值等于多少吗？请你帮助两人解决上述问题．

—Yes, ________.  

— How do ____ (America) students usually go to school?

— Well, they usually walk or take a yellow school bus to school.