—I see. I'll go right away and ________.
A:pay him back
B:pay him off
C:put him away
D:put him off
在植物叶片中,靠近上表皮的部位气孔比较多, 这样有利于气体的进出。
分式1x2+3x与1x2-9的最简公分母是( )
若B处为太平洋上,则该气压系统的名称是( )