Press the _____________ button until it ___________ into place. A: emergency stop, opens B: emergency stop, locks C: emergency start, opens D: emergency start, locks

已知事务T1的封锁序列为：LOCKS(A)…LOCKS(B)…LOCKX(C) …UNLOCK(B)…UNLOCK(A)…UNLOCK(C) 事务T2的封锁序列为：LOCKS(A)…UNLOCK(A)…LOCKS(B) …LOCKX(C)…UNLOCK(C)…UNLOCK(B) 则遵守两段封锁协议的事务是（　　）

Hewentintotheroomand_____thedoor. A: locking B: locks C: locked

If the locks of your bag are damaged because of the inspection, TSA will ________.

—Don’t forget _______ the door when you go out． —OK．I won’t forget it． A: A．lock B: B．locking C: C．to lock D: D．locks

One reason the children treat Margot badly is because she... A: stays away from the jungle. B: locks children in closets. C: writes poetry about the rain. D: might get to return to Earth.

What should a tenant do if he is worded about the security of his home A: Fit new locks on all the doors. B: Discuss the matter with the owner. C: Complain to the police. D: Increase his own insuranc

事务T1符合两段锁封锁法的序列是（） A: LOCK S(A)...LOCKS S(B) ...UNLOCK (B) ... UNLOCK (A) B: LOCK S(A) UNLOCK (A) LOCK S(B) UNLOCK (A) C: LOCK S(B) LOCK X(A) UNLOCK (A) LOCK S(C) D: UNLOCK (A) UNLOCK (B) LOCK X(A) LOCK X(B)

Notice of Baggage Inspection(检查) To protect you and your fellow passengers, the Transportation Security Administration (TSA) is required by law to inspect all checked baggage. As part of this process, some bags are opened and inspected.Your bag was among those selected for inspection. During the inspection, your bag and its contents may have been searched for prohibited (违禁的) items. After the inspection was completed, the contents were returned to your bag. If the TSA security officer was unable to open your bag for inspection because it was locked, the officermay have been forced to break the locks on your bag. TSA sincerely regrets having to do this. However, TSA is not responsible for damage to your locks resulting from this necessary security measure . For packing tips tions on hot www.tsa.gov. We appreciate your understanding and cooperation. If you have questions, comments, or concerns, please feel free to contact the TSA Contact Center.

Passage 1 Left-handers and Right-handers Imagine you are a left-hander. Suddenly everything in the world is changed. The door locks are on the wrong side of doors. The shift-gears in your car is in the wrong place. Handles on tin openers are on the wrong side and turn the wrong way. Twenty-five million Americans wake up every day in just such a sorry situation. They are one in ten of us who are left-handed and must face the world designed for the right-handed majority. Why we are left or right-handed remains one of the greatest unsolved mysteries of science. We know that nearly two out of three lefties are men and that left-handedness runs in families. According to one study almost half of the children of two left-handed parents will be left-handed. The Scots-Irish family Kerr produced so many left-handers that in 1470 the family built its house stairway with a reverse twist. On the other hand, heredity alone cannot explain lefties. 84 percent of them are born of two right-handed parents. And in 12 percent of twins, one will be right-handed, the other left. Perhaps the greatest puzzle of all is not why some people are left-handed, but rather why so few are. In fact, almost equal numbers of individuals will favor either the right or the left. However, scientists are trying to set things right and they are beginning to study the many ways left-handers differ from right-handers by considering how their brains work. 1. Based on the passage, we know that of Americans are left-handers. A) 25% B) 10% C) 16% D) 12% 2. We can say from the passage that . A) scientists have found out how left-handers' brains work B) people prefer to be right-handers C) left-handers lead a life in somewhat inconvenient way D) no other families have so many left-handers as the Kerrs 3. Which of the following statements is true according to the passage? A) Half of the left-handers are men. B) Most of the twins are left-handers. C) There are more male left-handers than female ones. D) The greater part of left-handers have left-handed parents 4. Why so few people are left-handers . A) has nothing to do with heredity B) is not known by scientists C) puzzles left-handed people D) is no concern of common people 5. The word "reverse" (Last Line, Para.3) most probably means . A) contrary B) different C) ridiculous D) mysterious New Words and Expressions heredity 遗传 twist 弯曲，曲折处