A:清水
B:碘液
C:生理盐水
D:浓糖水
仰观宇宙之大,俯察品类之盛,____,____,信可乐也。(王羲之《兰亭集序》)
Did you _______ Gary _______ in his bedroom when you walked past last night?
解方程组
(1) x-2y=55x+4y=-3
(2) x+y=42x-y=-1(用作图方法求解)