A:炎帝
B:黄帝
C:大禹
D:舜
There is a c____ (矛盾) between what you say and what you do.
请以“自信”为话题写一篇文章。除诗歌外文体不限,题目自拟,不少于600字。
点P(1,﹣1)到直线x﹣y+1=0的距离是____ .