若x 1 ~x 5 满足下列方程组: 2 x 1 + x 2 + x 3 + x 4 + x 5 =6 x 1 +2 x 2 + x 3 + x 4 + x 5 =12 x 1 +x 2 +2 x 3 + x 4 + x 5 =24 x 1 + x 2 + x 3 +2 x 4 + x 5 =48 x 1 + x 2 + x 3 + x 4 +2 x 5 =96 ;求3x 4 +2x 5 的值.
【单选题】听力原文:Is Ms. Kim going to the conference, or is it just us? (A) O.K., I'll book the tickets. (B) I think we should rent a car. (C) I was told it'll just be you and me. (37)
【单选题】Ⅱ.Grammar and Vocabulary Section A 25.If I walk in this city myself, I’ll probably get lost as I haven’t got _______very good sense of ________direction.