Why is Mr. Davis writing to Ms. Scott？

A . to uniquely identify the archived log files with the restore operation B . to uniquely identify the archived log files with the redo log group number C . to uniquely identify the archived log files for each incarnation of the database D . to uniquely identify the archived log files with the number of recovery operations performed

A．To inquire about office space B．To express interest in buying a condo C．To advertise his legal services D．To ask about the open house

A．He fixes bicycles. B．He raises sleep. C．He sells chairs. D．He's a gardener.

A．Because she wants to play a camp with Mary. B．Because she wants to enjoy the sunshine with Mary. C．Because she wants to introduce a new drink to Mary. D．Because she wants to share her drink with Mary.

A．Because she wants to be a tutor in his family. B．Because she likes making friend with him. C．Because she wants to get the job as a housemaid. D．Because she wants to cook food for him.

A．To recruit prospective employees B．To meet representatives from other mobile companies C．To evaluate the marketing techniques of his company"s competitors D．To gather information about vendors his company may work with

A．To offer her a position at a nonprofit organization B．To congratulate her on her promotion C．To invite her to a symphony performance D．To request information about her job

A．To hire his contractor services B．To place an order for supplies C．To report on materials options D．To ask for a product discount

A．so B．while C．when D．or

A．going B．go C．to go D．gone

A．A.It is not useful B．B.It is not necessary C．C.They have to pay an extra premium for special additional risks D．D.They don't like addtional risks

A．To encourage other car makers to sell more cars. B．To make his way of manufacturing known to others. C．To win praise from people the world over. D．To advise the world to buy his assembly line.

A．why B．that C．because D．for

是 否

A．a ; the B．the ; the C．the; 不填 D．a; 不填

Although no one is certain why migration occurs, there are several theories. One theory is based upon the premise that prehistoric birds of the northen Hemisphere were forced south during the Ice Age, when glaciers covered large parts of Europe, Asia, and North America. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit, and now, although the glaciers have disappeared, the habit continues. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory, known as photoperiodism, suggests a relationship between increasing daylight and the stimulation of certain glands in the birds' bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight. According to one theory, when the glaciers disappeared, birds ______. () A．stopped migrating B．continued migrating C．began migrating again D．migrated south and stay there