[单项选择]One tool that is useful during both analysis and design is the ______, which is a pictorial representation of the items of information(entities) within the system and the relationships between these pieces of information.
A. data dictionary
B. dataflow diagram
C. use case diagram
D. entity-relationship diagram

[单项选择]One tool that is useful during both analysis and design is the （）, which is a pictorial representation of the items of information (entities) within the system and the relationships between these pieces of information.
A. data dictionary
B. dataflow diagram
C. use case diagram
D. entity-relationship diagram

[单项选择]During the one-month trial period, customers are under no ______ to sign any contracts.
A. pledge
B. promise
C. obligation
D. engagement

[填空题]

Both of them were presidents during the years of

[简答题]During the past few weeks, newspapers on both sides of the Atlantic have revealed in breathless terms the latest plan to invade Iraq.
They have described massive thrusts by armour from all sides; airborne attacks to take out Baghdad; vast seaborne raids. Saddam Hussein, according to one version, will be removed by dissidents inserted into Iraq backed by US Special Forces. Alternatively, Saddam will be taken out in a precision strike.
Civilian officials in the Bush administration have huffed and puffed about the "leaks", to the amusement of the intelligence and military professionals. "One thing you can say with an awful lot of certainty," one told The Observer newspaper in London last week, "is that there is going to be an awful lot of deception going on over the next few months."
Deception is one of the oldest of the military’s black arts. But the fact of the existence of deception is important in itself. It is, in the terminology of these things, a "combat indica

[单项选择]G
One morning during breakfast, Robert was reading a letter. "Look, dear," he said to his wife Mary, "someone sent these two tickets for the play this evening. Wasn’t that kind " "Who sent them " asked Mary. "I’ve no idea," said Robert. "There’s a note in the envelope, but it says: ’Can you guess who sent these two tickets to you ’" "Well, never mind," said Mary, "I expect one of our friends wants to give us a surprise."
After dinner that evening, Robert and Mary put on their best clothes and went to the play. They had a wonderful evening and came home very grateful (感激) to the unknown friend who had given them the tickets. But when they got back to their flat (公寓), they found that a thief (窃贼) had been there. In fact, everything they owned had been stolen—furniture, pictures, clothes, money and even the knives and forks in the kitchen. At the center of the kitchen table was another note. This one said, "Now can you guess who sent the tic
A. Right.
B. Wrong.
C. Doesn’t Say.

[单项选择]G
One morning during breakfast, Robert was reading a letter. "Look, dear," he said to his wife Mary, "someone sent these two tickets for the play this evening. Wasn’t that kind" "Who sent them" asked Mary. "I’ve no idea," said Robert. "There’s a note in the envelope, but it says: ’Can you guess who sent these two tickets to you’" "Well, never mind," said Mary, "I expect one of our friends wants to give us a surprise."
After dinner that evening, Robert and Mary put on their best clothes and went to the play. They had a wonderful evening and came home very grateful (感激) to the unknown friend who had given them the tickets. But when they got back to their flat (公寓), they found that a thief (窃贼) had been there. In fact, everything they owned had been stolen—furniture, pictures, clothes, money and even the knives and forks in the kitchen. At the center of the kitchen table was another note. This one said, "Now can you guess who sent the tickets/A. Right.
B. Wrong.
C. Doesn’t Say.