Before long，the noise dropped eompletely．

A . guarantee undo retention B . add one more redo log group C . size the redo log files appropriately D . size the UNDO tablespace appropriately E . size the SYSTEM tablespace appropriately F . configure an appropriate undo retention interval G . change automatic undo management to manual

A . guarantee undo retention B . add one more redo log group C . size the redo log files appropriately D . size the UNDO tablespace appropriately E . size the SYSTEM tablespace appropriately F . configure an appropriate undo retention interval G . change automatic undo management to manual

A . turning B . setting C . driving D . putting

A . prevented B . distracted C . angered D . upset

A . 5 seconds B . 10 seconds C . 15 seconds D . 20 second

A. trial B. pursing C. pursuit D. running

A、maintained B、expanded C、increased D、declined

A．have they known; get B．have they known; were going to get C．do they know; are going to get D．had they known; got

A．A.usage B．B.use C．C.broken up D．D.used

Today the car is the most popular sort of transportation in all of the United States. It has completely replaced the horse as a means of everyday transportation. Americans use their car for nearly 90 percent of all personal trips. Most Americans are able to buy cars. The average price of a recently made car was $ 2050 in 1950, $ 2740 in 1960 and up to $ 4750 in 1975. During this period American car manufacturers set about improving their products and work efficiency. As a result, the yearly income of the average family increased from 1950 to 1975 faster than the price of cars. For this reason purchasing a new car takes a smaller part of a family's total earnings today. What was the only use of trains before the 20th century？ A．The use for short-distance transportation. B．The use for day to day transportation. C．The use for long-distance transportation. D．The use for transportation of precious things.

A．will it B．do we C．won't we D．does it

Recent studies have shown that the parts of the brain that we use to learn a task become active again during sleep. This activity, scientists suggest, could be the brain transferring memories from short-term to long-term storage. But the brain doesn't necessarily wait until the lights are out to begin processing those memories. To find out how the brain handles memories during waking hours, scientists gave 15 volunteers two tasks, each requiring different parts of the brain to learn. In one task, the subjects learned how to navigate a virtual town and then searched the town for an object. In the second task, they learned to predict where a sequence of dots would appear on a screen. Using a special machine, the researchers scanned the volunteers' brains right before and right after the tasks. They compared the two images to see whether the regions of the brain involved in learning the task were still active even after the task was completed. After a break, the scientists took a third image of each participant's brain. They wanted to determine whether these regions in the brain continued to be active after snore time had passed. They discovered that, for at least an hour after learning a task, the brain stays active. It appears to continue processing the new information. Furthermore, the images showed that distracting the subjects doesn't affect their ability to store memories. The processing continues even when they're thinking about or doing other things. Some scientists say this could mean that sleep isn't essential for storing memories. Others disagree. Until that's settled, it's probably still better to be on the safe side, getting plenty of sleep. According to the passage, ______. A．a good night's sleep helps your brain permanently file away lessons learned during the day. B．the brain has to wait until the lights are out to begin processing those memories C．perhaps it's safe for anyone to get plenty of sleep when it has not been proved unnecessary for memory D．attracting the subjects doesn't affect their ability to store memories.

A、way B、direction C、sight D、myself

是 否

A．The CEO of a corporation B．The secretary of the CEO C．The assistant engineer D．The HR manager

A．excessive B．many C．more D．numerous