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【单选题】
设向量组α1,α2,α3,α4线性无关,则下列向量组线性无关的是A.
α1-α2,α2-α3,α3-α4,α4-α1
B.
α1+α2,α2+α3,α3+α4,α4+α1
C.
α1+α2,α2+α3,α3-α4,α4-α1
D.
α1+α2,α2-α3,α3-α4,α4-α1
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【单选题】听力原文：M: I knew Mary played the piano．but I didn't know she played the guitar． W: Neither did I．It seems she just picked it up on her own，over the summer．She does have an artistic talent． Q: What can w...
A.
Mary doesn't have much talent for the piano.
B.
Mary taught herself to play the guitar.
C.
Mary prefers to play the guitar now.
D.
Mary got the guitar unexpectedly on her way home.
【多选题】以下有关北京卢沟桥的表述正确的是()
A.
于北京市丰台区永定河上
B.
建于明朝
C.
京现存最古老的连拱石桥
D.
937年7月7日，侵华日军在此制造了卢沟桥事变（即“七七事变”）
E.
狮，大小共483个，现修复后301
【单选题】听力原文：M: I knew Linda played the piano, but I didn't know she played the guitar. W: Neither did I. It seems she just picked it up on her own over this summer. Q: What does the woman mean? (14)
A.
Linda made her own guitar.
B.
Linda taught herself to play the piano.
C.
Linda taught herself to play the guitar.
D.
Linda doesn't have much talent for music.
【简答题】I played tennis with John and ____________ (我被他打败了).
【简答题】轮胎上的标记 4308 代表该轮胎的生产日期为 ______ 年第 ______ 周。
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