close down,close up和close out 都有关闭的意思,如何区分?此外close is a foggy day today,so we have to close _______our airport for a short time.A down B away C up D out没有看题目拉

closeup意思是（伤口）愈合隐瞒掩饰思想感情等
closedown电台或电视台在一天的播放后结束播放
停止播音

close down 电台或者电视台在一天播送之后结束广播
close out 商行以折价清仓甩卖
close up 互相靠拢，靠近，缩小间隙，伤口愈合。
没有close away 的说法哦。

D.out
close down:
vt.关闭(停止播送,降临)
例句与用法:
1.It is midnight and we are now closing down.
时间已到午夜,本台现在停止广播.
2.The company had decide to close down its three branch in europe.
该公司已决定关闭它在欧洲的三个分公司.
3.All the stores and shops in this city don't close down on Sundays.
这个城市的大小商店星期天都不关门.
close up:
a.靠近(愈合,关闭,封闭)
例句与用法:
1.Sorry,madam,we're closing up for lunch.
很抱歉,小姐,我们现在要关门吃午饭.
2.She snuggled close up to him.
她紧紧地挨著他.
close out:
vt.抛售(停止,停业)
例句与用法:
1.They intended to close out all their stock.
他们打算卖光所有的存货.
2.The store is closing out a large stock of toys.
该店正减价出售大批玩具存货.