A:①②
B:②③
C:①④
D:③④
按要求写句子。
电脑网络如同____
把比喻句补充完整
先化简,再求值:(x2)3÷x4﹣(x+2)(x﹣2)+(x+1)2,其中x=﹣ 12 .
直线x+ky=0,2x+3y+8=0和x﹣y﹣1=0交于一点,则k的值是( )
The people in Ya'an have met lots of difficulties, but they haven't ________ hope.