What happened last month？

A . these B . - C . what D . when

A、for B、on C、at D、about

A . You get an error because of a primary key violation. B . The data and structure of the EMPLOYEES table are deleted. C . The data in the EMPLOYEES table is deleted but not the structure. D . You get an error because the statement is not syntactically correct.

A．He post copies to many people. B．He forgot about its contents. C．He published it in a journal. D．He shared it with his colleagues.

W: Actually they were sent to you on Monday with the company courier. You haven't received them yet？ M: No, and I will check with the courier's office. But meanwhile, could you send them again, just to ensure that I have them by this afternoon？ I really appreciate it. W: Sure, I'll try to get them on the 9 o'clock courier run. Who most likely are the speakers？ A．The manager and his secretary B．Close friends in the same apartment C．Colleagues from the company D．Customer and postman

A. the other B. more C. another D. other

A．不填; 不填 B．不填; the C．a; the D．a; 不填

A．skipped B．dodged C．escape D．avoided

A．has been going B．was going C．went D．to be has gone

A．Sleepwalking. B．Nap. C．Doze. D．Dream.

2. Yet the implication that rapid change is a new phenomenon is again misleading. If you measure the time it takes for a technology to become widely diffused, today's experience does not seem unusual. Take the car. The basic patent for an internal-combustion engine capable of powering a car was fried in 1877. By the late 1920s—50 years later—over half of all American households owned a car. 3. The comparable dates for the computer axe harder to tie down, but the first big computer, based on vacuum valves, was built in 1946. The transistor—the first semiconductor device—was invented at Bell Laboratories in 1948. The first patent for an integrated circuit was filed in 1959. Now, in 1999-50 years after the first one was built—around half of American households own a computer. The pace of introduction has been similar to that of the car. 4. You have to cheat, choosing only the date for the personal computer, say(mid-1970s), or the internet (ditto) to make it seem much more rapid. Comparing its diffusion among private users is, you might say, unfair to the computer, for that machine's main use is in businesses. On that measure, the best historical analogy is with electrification, and the spread of the electric dynamo into factories. 5. According to Paul David, a historian at Stanford University in California, the first electricity-generating stations had been installed in New York and London in 1881, but it was well into the 1920s before the dynamo became widely used and started to raise productivity. The adoption of the computer in business has also been slow, and failed to have any measurable impact on productivity until very recently.

During the discussion of rock singing verses at last month's stockholders' meeting, Levin asserted that "music is not the cause of society's ills" and even cited his son, a teacher in the Bronx, New York, who uses rap to communicate with students.

A．The waters are salty. B．The waters are not very salty. C．The salinity is decreasing. D．The sea water is becoming less and less.

A．negative B．positive C．hopeless D．enlightening

A．didn't you B．did you C．mustn't you D．needn't you