close down,close up和close out 都有關閉的意思,如何區分?此外close

題目：

close down,close up和close out 都有關閉的意思,如何區分?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
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解答：

D.out
close down:
vt.關閉(停止播送,降臨)
例句與用法:
1.It is midnight and we are now closing down.
時間已到午夜,本台現在停止廣播.
2.The company had decide to close down its three branch in europe.
該公司已決定關閉它在歐洲的三個分公司.
3.All the stores and shops in this city don't close down on Sundays.
這個城市的大小商店星期天都不關門.
close up:
a.靠近(癒合,關閉,封閉)
例句與用法:
1.Sorry,madam,we're closing up for lunch.
很抱歉,小姐,我們現在要關門吃午飯.
2.She snuggled close up to him.
她緊緊地挨著他.
close out:
vt.拋售(停止,停業)
例句與用法:
1.They intended to close out all their stock.
他們打算賣光所有的存貨.
2.The store is closing out a large stock of toys.
該店正減價出售大批玩具存貨.