Open adj．, verb, nounadj．NOT CLOSED1 allowing things or people to go through: A wasp flew in the open window． She had left the door wide open．
2 （of sb’s eyes, mouth, etc．） with eyelids or lips apart: She had difficulty keeping her eyes open （=" because" she was very tired）．He was breathing through his open mouth．3 spread out; with the edges apart: The flowers are all open now．
4 not blocked by anything: The pass is kept open all the year．NOT FASTENED5 not fastened or covered, so that things can easily come out or be put in: The bag burst open and everything fell out．
verbDOOR / WINDOW / LID1 [vn] to move a door, window, lid, etc．so that it is no longer closed: Mr Chen opened the car door for his wife． close2 [v] to move or be moved so that it is no longer closed: The door opened and Alan walked in． The doors of the bus open automatically．closeCONTAINER / PACKAGE3 [vn] to remove the lid, undo the fastening, etc．of a container, etc．in order to see or get what is inside: Shall I open another bottle? She opened her bag and took out her passport．EYES4 [vn, v] if you open your eyes or your eyes open, you move your eyelids upwards so that you can see closeCOMPUTING5 [vn, v] to start a computer program or file so that you can use it on the screenopen doors for sb to provide opportunities for sb to do sth and be successful open your / sb’s eyes （to sth） to realize or make sb realize the truth about sth: Travelling really opens your eyes to other cultures．open your / sb’s mind to sth to become or make sb aware of new ideas or experiences．
open the way for sb/sth （to do sth） to make it possible for sb to do sth or for sth to happen: The agreement could open the way for the country to pay off its debts．—more at heart, heaven open into / onto sth to lead to another room, area or place: This door opens onto the yard． The two rooms open into each other．open out to become bigger or wider: The street opened out into a small square．open out （to sb） to become less shy and more willing to communicate open up1 to talk about what you feel and think: It helps to discuss your problems but I find it hard to open up．2 to begin shooting: Anti-aircraft guns opened up．3 （often used in orders） to open a door, container, etc．: Open up or we’ll break the door down! open up1 to become or make sth possible, available or able to be reached: The new catalogue will open up the market for our products． The railway opened up the east of the country．
2 to begin business for the day; to start a new business: I open up the store for the day at around 8．30． close up3 to start a new business: There’s a new Thai restaurant opening up in town． close down
noun the open [sing．] OUTDOORS1 outdoors; the countryside: Children need to play out in the open．NOT HIDDEN2 not hidden or secret: Government officials do not want these comments in the open．
1．Which of the following “open” is closest in the meaning with the “open” in the sentence “The book lay open on the table．”
A．She had left the door wide open．
B．The bag burst open and everything fell out．
C．The flowers are all open now．
D．He opened the letter and read it．
2．Fill in the blank in the sentence “He’s eager to __________different kinds of music．”
A．open the minds of his audience to
B．open the eyes of his audience to
C．open the way for his audience to listen to
D．open doors for his audience to listen to
3．What does the phrase “ the open” mean in “ When you feel tired after a day’s hard work, you’d better invite some friends to the open to relax yourself．”
A．the gym B．the cinema C．the countryside D．the music room
4．Choose one of the following to complete the sentence, “Exciting possibilities__________for her in the new job”．
A．were opening out B．were opening into
C．were opening onto D．were opening up
2KCl + 3O2↑（4）Ⅰ：可随时控制反应的发生与停止 Ⅱ：节约药品 (废物利用、可获得平稳的气流、控制反应的速率等);石灰石或大理石