A:眼花缭乱 稍纵即逝 铤而走险 坚如磐石
B:锲而不舍 惹事生非 一泻千里 广袤无垠
C:走投无路 脍炙人口 甘败下风 如失重负
D:骇人听闻 坦荡如砥 以身徇职 穿流不息
This is Mr White's ________ trip to Beijing. He has been there twice before.
如果一元二次方程x2﹣2x﹣3=0的两根为x1、x2,则x12x2+x1x22的值等于( )
英译汉
I'm sorry to hear that your brother's ____ (break) his leg.