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提问人：网友waluheke 发布时间：2022-01-07

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Question 4 Suppose you are in charge of a toll bridge that is essentially cost free. The d

Question 4

Suppose you are in charge of a toll bridge that is essentially cost free. The demand for bridge crossings Q is given by P=12-2Q.

(a)Draw the demand curve for bridge crossings.

(b)How many people would cross the bridge if there were no toll？

(c)What is the loss of consumer surplus associated with the charge of a bridge toll of ＄6？

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更多“Question 4 Suppose you are in charge of a toll bridge that is essentially cost free. The d”相关的问题

第1题

Consider following Figure. Assuming TCP Reno is th...

Consider following Figure. Assuming TCP Reno is the protocol experiencing the behavior shown above, answer the following questions. In all cases, you should provide a short discussion justifying your answer. 1). What is the value of ssthresh at the 24th transmission round？ 2). During what transmission round is the 70th segment sent？ 3). Assuming a packet loss is detected after the 26th round by the receipt of a triple duplicate ACK, what will be the values of the congestion window size and of ssthresh？ 4). Suppose TCP Tahoe is used (instead of TCP Reno), and assume that triple duplicate ACKs are received at the 16th round. What are the ssthresh and the congestion window size at the 19th round？ 5). Continue with question 10), and again suppose TCP Tahoe is used, and there is a timeout event at 22nd round. How many packets have been sent out from 17th round till 22nd round, inclusive？ Consider following Figure. Assuming TCP Reno is th

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第2题

Section BDirections: This section is to test your ability to understand short conversation

Section B

Directions: This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions. The conversations and the questions will be spoken only once. When you hear a question, you should choose the correct answer from the 4 choices marked A, B, C, and D.

听力原文：M: May I speak to Petty？

W: Speaking.

M: Good morning, Petty.

W: Good morning, Steward.

M: I'd like to discuss your suggestion with you as soon as possible. Would Tuesday be all right for you？

W: Tuesday. That's tomorrow？

M: Yes.

W: Let me see. How about tomorrow, say, 8:30？

M: Then suppose I come to your office at 8:30 tomorrow.

W: Good. I'll be expecting you then,

M: Thank you. Good-bye.

W: Good-bye.

(6)

A．8:30 in the morning, Tuesday.

B．8:30 in the evening, Tuesday.

C．8:30 in the morning, Monday.

D．8:30 in the evening, Monday.

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第3题

Woman: Anne says she'll be visiting us on Friday. Man: I suppose that'll be the last we'll

see her until she comes back to college in the fall. Question: What time does the conversation probably take place？

A．At the beginning of the term.

B．Towards the end of the term.

C．During the Christmas season.

D．During the summer vacation.

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第4题

Section BDirections: This section is to test your ability to understand short conversation

Section B

听力原文：W: It was a heavy storm last night, wasn't it？

M: It certainly was. The wind broke several windows. What weather!

W: Do you know that big tree in front of my house？ One of the biggest branches came down in the night.

M: Really？ Did it do any damage to your home？

W: Thank goodness! It is far away from that.

M: I really hate storms. It's about time we had some nice spring weather.

W: It's April, you know. The flowers are beginning to blossom.

M: Yes, that's tree. But I still think the weather is terrible.

W: I suppose we should not complain. We had a fine March after all.

(6)

A．The tree was broken.

B．AI1 the leaves fell down.

C．One of the branches fell down.

D．The tree. was cut down.

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第5题

Section BDirections: This section is to test your ability to understand short conversation

Section B

听力原文：W: How will you like college, Simon？

M: I doubt if I'll like where it is and its size. It looks as if it's very small.

W: Yes, it's very pleasant. There are only about a thousand students.

M: What kind of students comes here？

W: That's a difficult question to answer. I suppose it's an impossible question to answer, really. There are all kinds. They're difficult to describe.

M: What do they do in their spare time？

W: All kinds of things. There are a lot of different kinds of clubs to join. Some students meet their friends at the Union. Some go to the library to study.

M: Do they have to go to the library to study？

W: No, they can study where they want to.

M: Do you know what sports they play？

W: Oh, yes, there are teams for all kinds of sports.

M: It sounds as if going to college is fun.

Q9. How does Simon find the college？

(10)

A．He likes its position and its size, but he doesn't think it's very big.

B．He likes its buildings and its size, but he thinks it's very small

C．He doesn't like its position or its size, but he thinks it's very big.

D．He likes its position and its size, he thinks it's very big.

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第6题

Research on animal intelligence always makes me wonder just how smart humans are. 1 the fr

uit-fly experiments described in Carl Zimmer’s piece in the Science Times on Tuesday. Fruit flies who were taught to be smarter than the average fruit fly 2 to live shorter lives. This suggests that 3 bulbs burn longer, that there is an 4 in not being too terrifically bright.

Intelligence, it 5 out, is a high-priced option. It takes more upkeep, burns more fuel and is slow 6 the starting line because it depends on learning — a gradual 7 — instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to 8 .

Is there an adaptive value to 9 intelligence？ That’s the question behind this new research. I like it. Instead of casting a wistful glance 10 at all the species we’ve left in the dust I.Q.-wise, it implicitly asks what the real 11 of our own intelligence might be. This is 12 the mind of every animal I’ve ever met.

Research on animal intelligence also makes me wonder what experiments animals would 13 on humans if they had the chance. Every cat with an owner, 14 , is running a small-scale study in operant conditioning. we believe that 15 animals ran the labs, they would test us to 16 the limits of our patience, our faithfulness, our memory for terrain. They would try to decide what intelligence in humans is really 17 , not merely how much of it there is. 18 , they would hope to study a 19 question: Are humans actually aware of the world they live in？ 20 the results are inconclusive.

1.______

[A] Suppose [B] Consider [C] Observe [D] Imagine

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第7题

Part ADirections: You will hear 10 short dialogues. For each dialogue, there is one questi

Part A

Directions: You will hear 10 short dialogues. For each dialogue, there is one question and four possible answers. Choose the correct answer ― A, B, C or D, and mark it in your test booklet. You will have 15 seconds to answer the question and you will hear each dialogue ONLY ONCE.

听力原文：W: What are you going to do with your house when you want to move away？

M: I intend to sell it. Then I decide to rent it.

W: You think you can get more to rent it than to sell it？

M: I suppose so.

What is the man going to do with his house？

A．He is going to sell it.

B．He will rent it to others.

C．He will give it to others.

D．He will move it.

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第8题

Part ADirections: You will hear 10 short dialogues. For each dialogue, there is one questi

Part A

听力原文：M: What are you going to wear today, Jane？

W: I'm going to wear my blue dress. I think it looks nice on me.

M: I suppose you can sometimes try on another kind of color for a change.

What color of clothes the woman is going to wear？

A．A brown dress.

B．A blue dress.

C．A suit.

D．An overcoat.

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第9题

Section ADirections: In this section, you will hear 8 short conversations and 2 long conve

Section A

Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer.

听力原文：W: What a shame about your accident! What a way to end your holiday!

M: Yes, it was bad luck. I suppose I should have been more careful.

Q: What are they talking about？

(12)

A．A holiday.

B．Luck.

C．Work..

D．An accident.

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第10题

听力原文：M：Good morning，I'm doing a survey for the Department of Health and Social Securit

y and I'd like to ask you a few questions if I may.

W: I suppose that'll be OK.

M: The first question is what is your full name？

W: Louisa O'Leary.

M: And your age, Mrs. O'Leary？

W: Well ... it's thirty-four.

M: Really？ You don't look it at all. Now how much does your husband earn？

W: That's a personal question, but I suppose I should try and be as frank as I can with you--￡ 10,000 a year.

M: That isn't much.

W: Yes.

M: Now what I'm really interested in is the way you spend your money. What about housiug, for example？

W: Well, our house costs us about ... er, ￡ 300 a month.

M: Oh, that must be difficult with ten thousand a year!

W: It certainly is. I was working before we had the baby, of course. That used to make things a lot easier. Now we're much less well off.

M: Mm. Apart from the house, where does your money go？

W: Food is the biggest item. That's about ￡ 240 a month for food and other small bits and pieces-cleaning materials and so on. For electricity, we only use it for lighting. That's about ￡ 50 a year.

(23)

A．He is doing a survey.

B．He is introducing himself.

C．He is talking with a friend.

D．He is selling a product.

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