She is working hard all day long,which will surely________ her success in her future work.
A:result from
B:contribute to
C:benefit from
D:stick to
向量a→=(2,-1,4),与b→=(-1,1,1)的夹角的余弦值为____
请以“合作”为话题,写一篇文章。题目自拟,除诗歌外文体不限。600字以上。