open
1)用作动词动词：打开门，经营、开办
：open a door/window/a small shop/one’s hand/one’s eyes/one’s mouth/fire开门/开窗/开一家小商店/张开手/睁开眼/张开嘴/开火;be opened to traffic通车;open up开采(发)
Now,he opens a small factory of his own.现在他自己办了个厂。
Open the door, please!请开门!
2)用作形容词,表状态，“开着的”：keep open开着门;be open开门、开业;cut…open切开;leave the door open 开着门;in the open air 在野外;an open secret公开的秘密;keep one’s eyes open睁眼
Don’t keep the door open.
别让门开着(即：请把门关上)。
[应用]选择正确答案
3) be open to对……开放
Many school libraries are open to children on Sundays.
不少学校的图书馆周日给孩子们开放。
①John was so sleepy that he could hardly keep his eyes________.(MET’92)
A.open B.to be opened
C.to open D.opening
②Some new oilfields ________since 1976.
A.were opened up B.has been opened up
C.have been opened up D.had been opened up
③The computer center, _________ last year,is very popular among the students in this school.
A.open B.opening
C.having opened D.opened
Key:①A ②C ③D
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