I know he's been curious about everything, but that's . Be patient!
A:what do kids like
B:what kids like
C:what are kids like
D:what kids are like
解方程组:
(1)2x+y=5x-2y=0
(2)2x-3y=-53x+2y=12.
我国空间技术跻身与世界先进国家行列的标志是( )