CAD软件对计算机的硬件要求很高，特别是（）。
A.内存
B.显卡和显示器
C.硬盘
参考答案：C
I think this is the first time that we have met.＿＿＿anywhere.
A．Before have we never seen each other
B．Never before we have seen each other
C．Each other have we seen never before
D．Never before have we seen each other
沉积有机质
