Falls are the number one cause of death to old people at home.Most old people can liv

Falls are the number one cause of accidental deaths in the home every year. (翻译成中文)

Falls are the number one cause of accidental deaths in the home every year.

Passage 1 Falls are the number one cause of death to old people at home. Most old people can live safely at home if they make a few changes. Falls are common as people are getting older. Up to half of home accidents could be prevented by making some very simple changes. Here are a few suggestions. Mark trouble spots with bright tapes. The first and last steps on stairs are usually high-risk accident are- as. Applying bright tapes and using bright light in these areas would make these spots easier to see. Put grab bars(扶手) in the bathroom. A large number of falls occur in the bathroom. This is unfortunate(不幸的) because it's easy to make the area safe from accidents. Putting grab bars in the bathroom gives people something to hang on to. Invest in a personal alarm. A personal alarm can be started if a person falls or otherwise gets in trouble. With the push of a button, the alarm automatically sends a signal, which gets someone to call and see if the person needs help. 题目： 1. By making some very simple changes at home, old people ______.

A、are free from home accidents

B、can improve their health

C、are likely to live longer

D、can live more safely

说明了稳定状态失业率是U/L=s/(s+f)。假设失业率开始时并不在这个水平。说明失业率将一直变动并达到这种稳定状态。(提示：把失业人数变动作为s，f和U的函数。然后说明，如果失业高于自然失业率，失业下降；如果失业低于自然失业率，失业增加。)

In this chapter we saw that the steady-state rate of unemployment is U/L=s/(s+f). Suppose that the unemployment rate does not begin at this level. Show that unemployment will evolve over time and reach this steady state. (Hint: Express the change in the number of unemployed as a function of s,f, and U. Then show that if unemployment is above the natural rate, unemployment falls, and if unemployment is below the natural rate, unemployment rises.)

请根据以下内容回答 76～85 题：

Directions: There are 10 blanks in fhe following passage. For each numbered blank,there are 4 choices marked A, B, C and D． Choose one to complete the dialogue and mark your answer on the ANSWER SHEET with a single line through the center.

For reasons of safety and ease of maintenance, Washington and dozens of other communities are building rubber sidewalks made 76 ground-up tires of cars and bikes. The rubber squares are up to three times more expensive than concrete squares but 77 longer, because tree roots and freezing weather won't crack them. That, 78 , could reduce the number of slip-and-fall complaints made 79 uneven pavements. The shock absorbing surface also happens to be easier on the joints of slow runners and more forgiving when someone slips or falls, and the rubber sidewalks are considered more environmentally friendly. They 80 a way to recycle some of the estimated 290 million tires 81 out each year in the United States, and they do not restrict tree.roots the way concrete squares 82 . Since 2001, a company, Rubber sidewalks, has been grinding thousands of old tires into small pieces, 83 sticky substances and baking the material into sidewalk sections that weigh less than eleven pounds a square foot, or a quarter of the weight of concrete. The rubber squares are now 84 in two colors of gray and orange. The District of Columbia has spent about $60,000 to replace broken concrete with the rubber squares here and there in a residential 85 northeast of the Capital.

第 76 题

A． by

B． on

C． of

D． for

n designed to help senior citizens living alone.

Manufactured by robotics company Shanghai PT Info, the brightly colored robot, which costs 5,000 yuan ($790), was launched on Aug 14 to help entertain and monitor elderly people.

In Shanghai last year, the number of registered residents at least 60 years old was 4 million. That was nearly 30 percent of the population. By 2018, the figure is projected to rise to 5 million.

With many living alone, robots such as Roby Mini can help play a crucial role in caring for the elderly. "It will change the way people interact with digital products," Hong says.

Founded in May, Shanghai PT Info had already done the groundwork. In fact, the research team spent three years developing the speech recognition system before the firm was officially launched.

With 360-degree wheels hidden under its body, Roby Mini can follow a person through face recognition and strike up a conversation, tell jokes or provide information.

The robot also works as a computer terminal, supplying weather information, ordering groceries online and even booking taxis. Roby Mini can be connected to other gadgets as well, such as smart wristbands or magnetic devices on doors.

Roby Mini can also connect an elderly owner to a doctor through its high-definition screen.Already Shanghai PT Info is talking to three community hospitals in Shanghai's Minhang district. Since the robot is linked to the Internet, it can support long-distance audio and video calls.

Mass production started this month and Shanghai PT Info plans to manufacture 200,000 units this year.

But the future is not easy for Shanghai PT Info. Earlier this year, Flyingwings Intelligent Robot Technology (Shanghai) introduced a machine with sensors that will ring an alarm when an elderly person falls down.Tianjin ShangjiuShengyuan Technology Group also developed a robot for seniors in 2014. Owners can turn on the lights and air-conditioning units by pressing buttons on the machine.It can also remind elderly owners to take pills, and inform. them of hospital checkups and family birthdays.

1. Roby Mini is the name of.{A; B; C}

A. a robotics company

B. a robot

C. a senior citizen living alone

2. Roby Mini is designed to.{A; B; C}

A. help look after children living alone in senior high school

B. help entertain and monitor senior citizens

C. change the way people interact with digital products

3. According to this passage, the number of registered residents at least 60 years old will be. {A; B; C}

A. 4 million next year

B. 30 percent of the population

C. increase to 5 million by 2018

4. The writer thinks “the future is not easy for Shanghai PT Info” because.{A; B; C}

A.there are too many elder people in Shanghai

B. Roby Mini cannot ring an alarm when an elderly person falls down.

C. the company will face tough competition in the marketplace

5. The best title for this passage is.{A; B; C}

A. How to Use a Robot

B. Elder People Increase in Shanghai

C. Robot Gives Help to Older People

a.在没有对外贸易时，美国和欧洲汽车市场上均衡的厂商数量是多少？

b.在没有对外贸易时，美国和欧洲汽车市场上均衡的价格是多少？

c.现在假设美欧之间进行自由贸易，美国市场上除了原有的3亿人口外，将增加5.33亿人口。在美国和欧洲汽车市场上将有多少汽车厂商？汽车新的均衡价格是多少？

d.美国市场上汽车的价格在b和c中为何不同？自由贸易改善了消费者的福利吗？是怎样改善的？

Suppose that fixed costs for a firm in the automobile industry (start- up costs of factories， capital equipment， and so on) are $5 billion and that variable costs are equal to $17，000 per finished automobile. Because more firms increase competition in the market， the market price falls as more firms enter an automobile market， or specifically， where n represents the number of firms in a market. Assume that the initial size of the U.S. and the European automobile markets are 300 million and 533 million people， respectively.

a.Calculate the equilibrium number of firms in the U.S. and European automobile markets without trade.

b.What is the equilibrium price of automobiles in the United States and Europe if the automobile industry is closed to foreign trade？

c.Now suppose that the United States decides on free trade in automobiles with Europe. The trade agreement with the Europeans adds 533 million consumers to the automobile market， in addition to the 300 million in the United States. How many automobile firms will there be in the United States and in Europe combined？ What will be the new equilibrium price of automobiles？

d.Why are prices in the United States different in (c) than in (b) ？ Are consumers better off with free trade？ In what ways？