由②得y=2x-1③,
将③代入①得:3x+5(2x-1)=8,
解得x=1,
代入③得:y=1.
∴原方程组的解为x=1y=1.
In most western countries, on April Fool’s Day,people often play _____ trick on each other; children especially have great _______ fun.
A.a;a
B.the;the
C.不填;a
D.a;不填
植物的组织培养是利用____________的原理,使植物组织在人工控制的条件下,通过细胞的___________和__________,快速发育成新植株的高新技术手段。