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【单选题】
自然界有这样一种现象：当一株植物单独生长时，显得矮小、单调，与众多同类植物一起生长时，则根深叶茂，生机盎然。人们把类似植物界中这种相互影响、相互促进的现象，称为“共生效应”。 根据上述定义，下列最符合共生效应的是：A.
某大学一寝室，六名同学入学成绩有高有低，四年里六人每天结伴学习，最后都考上了重点大学的研究生
B.
和狼生活在一起，你只能学会嗥叫；和那些优秀的人接触，你就会受到良好的影响
C.
某品牌为摆脱个体经营的局限，采取连锁经营的方式扩大经营范围，销量随之大大提高
D.
亲小人，远贤臣，此后汉所以倾颓也
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【单选题】On opening the cases we found that 25 sets of video-recorders had ______ by sea-water, and seem to be a completed write-off.
A.
been damaged
B.
damaged
C.
damaging
D.
been damaging
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