A smile costs __________, but it gives so much. So we should learn to smile.
A:nothing
B:something
C:anything
D:everything
双曲线y=kx与直线y=2x+1的一个交点横坐标为﹣1,则k=( )
①开庭最晚结束最早 ②审讯时间最长 ③审讯规模最大
④判处绞刑人数最多 ⑤对法西斯罪犯的审判最彻底