设a→、b→是不共线的两个向量,已知AB→=2a→+kb→,CB→=a→+3b→,CD→=2a→﹣b→,若A、B、D三点共线,求k的值.
将下列图片与相应的句子连线。
① ____ A. I like winter. I can skate.
② ____ B. I like spring. I can ride a bike.
③ ____ C. I like summer. I can swim.
④ ____ D. I like autumn. I can fly a kite.