Suppose the program：k=10;while kk=k-1;endkAfter the program is executed, k is（）

A . It is easier to make such a comparison. B . The master‘s program may better illustrate the difference. C . The master‘s program is simpler than the bachelor‘s program. D . It is of less interest to the writer to compare the bachelor‘s programs.

A . won’t he B . will he C . do I D . don’t I

A . 800 KW B . 5120 KW C . 6400 KW D . 4180 KW

A . 400 B . 500 C . 300 D . 200

A . in blame B . in blaming C . to have blame D . to blame

A . 0.78 B . 0.02 C . 0.7 D . 0.62

A . 正确 B . 错误

M: What do you mean？ W: Well, they have to be very careful not to offend people -- especially parents with young kids who might buy a CD that contained violent content or used strong language. M: How can that be avoided？ W: Well, don't you remember when that woman -- some senator's wife, I think, made a fuss over this issue？ It's not really a law, but music companies are now encouraged to put a warning label on albums that describe violence or use strong language. M: I don't understand. Doesn't that reduce the musician's freedom of speech？ W: Not really. Musicians still have a right to free speech, but the message on the label says, "Buyer, be careful: if you get upset by violence and ugly language, don't buy this album." You agree with that, don't you？ M: I don't know. I still think the whole thing is funny and unreasonable. Musicians should have the right to say what they want to say without having to have a warning label put on their music, I mean, who gets to decide what is considered offensive and what isn't, we don't need a sticker to tell us what to do! (20) A．Record companies should pay attention not to offend people. B．Record companies should be very careful with their employees. C．People should be very careful with their new CDs. D．Parents should forbid children to buy new CDs.

M: Sure, and I'll arrange for extra chairs. Is there anything else you want me to do？ W: Please get Hari to ensure that all the sound equipment is working fine. Last week we had a problem with the microphones. M: Yes, we need to be extra careful this time. But I'm sure Hari's at his job already. What does the woman want the man to do？ A．Send out the invitations. B．Arrange for accommodations. C．Welcome guests to a show. D．Supervise preparations for an event.

A．$11250 B．$10 012.50 C．$9 998.75 D．$9 968.93

A．1456 B．839 C．1260 D．346

M: Yes, I've set my mind on it. I'd like to find a job with full scope to show my ability. Q: Why has the man decided to leave the company？ (23) A．With a knife. B．On the edge of some metal. C．On some glass. D．On a piece of paper.

M: Thank you. As you can see, little by little, Americans are turning to solar power, tapping the strength of the sun for energy. W: Yeah, that's true. Sunlight has already been used for heating or cooling homes and office buildings in the sunny south. M: Experts say all signs point to the birth of the solar energy industry. Right now, an increasing number of companies are selling solar collector panels to heat and cool homes or to heat water. The glass and metal panels each cost from ＄100 to more than ＄500, and the three or four-bedroom home usually requires a dozen or more. They look like sandwiches. They are usually placed in rooftops. Nobody knows how many have been sold, and in addition, many people have built their own units. It has been estimated that solar power equipment will be a $1.3 billion industry by 1995, and more than a million homes will use sunlight for heat, air conditioning or to generate electricity, both in the cities and in countryside. W: Wow! That is really big business. What do we learn about the use of solar energy in the U. S. ？ A．It is very well established. B．It is relatively new. C．It is found in one million homes. D．It is being rapidly expanded.

Suppose a DMC has the property that for some input assignment P(x)＞0，x∈A={0，1，…，k-1}，the variance of I(x；y)=0．Prove that the input assignment achieves channel capacity．

M: I don't think so, but returning back home was really hard. W: Why？ M: Well, for many students, returning back to their home countries can be a very confusing experience. W: Re-entry Shock! That sounds quite interesting. Can you explain it？ M: For example, many students who come to the United States experience freedoms they have never enjoyed in their country. W: Sure, such as freedom from family, freedom from cultural norms they didn't like and freedom from the pressures of working in a real job. M: However, too much freedom and unstructured life can lead to other problems. Students sometimes skip classes, stay out late, and engage in activities that their families and cultures might not approve of, but students want to enjoy "freedom" while it lasts. W: So when students return back to their countries, they can struggle with fitting back into the cultural norms and family expectations of the past. M: Yes. Naturally, depression is possible and a loss of self can result. W: Then what can students do to minimize this Re-entry Shock？ M: First of all, keep in contact with your family and friends while you are abroad. They will be your first source of advice and support once you return. W: What else？ M: Second, have a clear plan what you will do when you return. Start looking for a job now or apply to enter a school months before you return. Re-entry Shock can be greatest when you have nothing to do when you return. (23) A．How to go abroad for study. B．How to enjoy the freedom abroad. C．How to look for a job after returning back from abroad. D．Re-entry Shock and how to reduce it.