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提问人:网友jolly_jackey 发布时间:2022-01-07
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Considering a simple portfolio investment strategy...

Considering a simple portfolio investment strategy: holding N risky assets that have identical expected returns, E(r), and standard deviations, σ, and putting 1/N of your money in each. Assume that the correlation coefficients of all pairs are ρ. Denote the standard deviation of each asset and the portfolio are σ and σP, respectively. The variance of the portfolio can be expressed asConsidering a simple portfolio investment strategyWhich of the following statements is correct?

A、The first part of the expression represents the non-diversifiable risk

B、The second part of the expression represents the non-diversifiable risk

C、If ρ=1, all risk can be diversified

D、If ρ=-1, all risk can be diversified

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第1题
We have made the task of balancing equations ____ easy by considering fairly simple reactions.
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第2题
What is the best health and insurance plan for me? 【S1】______Because choosing a health pla

What is the best health and insurance plan for me? 【S1】______

Because choosing a health plan can be a confusing experience. 【S2】______

Although there is no one "best" plan, there are some plans that which 【S3】______

will be better than others for you and for your family's health 【S4】______

needs. We will try to guide with you in simple terms. However, 【S5】______

if rather than just giving you answers, the best thing 【S6】______

what we can do is to make sure you are equipped with the right 【S7】______

questions.

There are three major things to consider, of each with their own 【S8】______

unique set of questions. By considering about the questions 【S9】______

thoroughly, you will arrive at the right plan for you and your family. 【S10】______

&8226; How affordable is the cost of health care

&8226; Do the included services match at my needs (access of care) 【S11】______

&8226; Have people had good results when they covered by a specific 【S12】______

plan (quality of care)

【S1】______

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第3题
To its fans, it is addictive. To the media, it is a promising money-maker. Sudoku, an old
puzzle long popular in Japan is fast ga【66】popularity the world over. In Britain, a sudoku book is a bestseller and national newspapers are competing【67】(feverish) to publish the most, and the most fiendish, puzzles.【68】, the puzzle is being published in newspapers from Australia to Croatia to America. Even the New York Times is considering intr【69】sudoku in its Sunday magazine, alongside its venerated crossword.

The game's ap【70】is that its rules are as simple as its solution is complex. On a board of nine-by-nine sq【71】most of them empty, players must fill in each one【72】a number so that each row (left to right), column (top to bottom) and block (in bold lines)【73】1 to 9. Advanced ver【74】use bigger boards or add letters from the alphabet.

Sudoku--the Japanese word combines " number" and " single"--seems perfectly suited【75】modern times, a puzzle for an era when people are more nu【76】than literate. And like globalism itself, sudoku transcends borders by【77】(require) no translation.

The overall business of puzzles is hard to measure【78】revenues in America from magazines, syndicated newspaper sales, books, and online and phone services are almost $ 200m annually. The New York Times【79】millions of dollars a year from its crosswords and hundreds of thousands from a special phone service that provides hi【80】. Over 30,000 people pay $ 35 a year for the newspaper's e-mail version.

(61)

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第4题
Canned Foods: Convenience and Nutrition Meeting your family's nutritional needs may seem d

Canned Foods: Convenience and Nutrition

Meeting your family's nutritional needs may seem difficult considering today's busy lifestyles. But it doesn't have to(51). Even a new emphasis(52)more fruits and vegetables doesn't necessarily mean more preparation time if you take(53) of the convenience of canned foods.

When you open a(54)of fruit or vegetable at home you have at hand fresh-packed nutritional produce, with no man-made ingredients, no preservatives. And all the work has been done for you: the slicing, the peeling, even the cooking. Canned fruits and vegetables leave you the(55) to be creative. And with the variety of fruits and vegetables available these days, you can serve different combinations, create new dishes, and(56) new tastes to old recipes. Canned foods are good as well. A United States Department of Agriculture and National Food Association co-sponsored study shows canned vegetables to be just as(57) as fresh or frozen. Because canned vegetables are processed within hours of(58)packed, they generally retain 70 to 90(59)of their nutrients.

Fruit and vegetable canning is as simple(60)when your grandmother "put up" tomatoes and other things from the garden. Fresh produce is taken from the field at just the right time, delivered to the cannery, checked, washed, sealed, and sterilized. All this generally happens in less(61) 24 hours to(62) the best quality and nutritional value without the need for any preservatives.

Use the liquids that vegetables are canned(63)as a substitute(64) water in recipes to get that last drop of good nutrition.

Most major brands of canned fruits and vegetables include nutritional content and ingredient statements on their(65). This is especially important to those on calories-conscious or restricted diets.

A.do

B.be

C.seem

D.need

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第5题
Nutritional statements that depend on observation or anecdote should be given serious cons
ideration, but consideration should also be given to the physical and psychological quirks of the observer. The significance attached to an experimental conclusion depends, in part, on the scientific credentials of the experimentalist; similarly, the significance of selected observations depends, again in part, on the preconceptions of the observer.

Regimes that are proposed by people who do not look as if they enjoyed their food, and who do not themselves have a well-fed air, may not be ideal for normal people. Graham Lusk, who combined expert knowledge with a normal appreciation of good food, describes how he and Chittenden, who advocated a low-protein diet, spent some weeks in Britain eating the rations of the 1914-1918 war and then got more ample rations on board ship. Lusk attributed his sense of well-being to the extra meat he was eating; Chittenden attributed it to the sea air.

When young animals are reared for sale as meat, the desirable amount of protein in their food is a simple matter of economics. Protein is expensive, so the amount given is increased up to the level at which the increased rate of growth is offset by the increased cost of the diet. As already mentioned, the efficiency with which protein is used to build the body diminishes as the percentage of protein in the diet increases. In practice, the best diets seem to contain between 15 and 25 per cent protein. It is not certain that maximum growth rate is desirable in children; some experiments with rats suggest that rapid growth is associated with a shorter ultimate expectation of life.

There are practical and ethical obstacles to human experiments in which the effect of protein can be measured. Children do not grow as fast as the young animals in which there is a commercial interest. Their need for protein is therefore presumably smaller, but there is no evidence that the desirable protein level, after weaning, is less than 15 per cent. An argument against this percentage of protein is that in human milk only 13 per cent of the solid material is protein. That protein is, however, of better quality than any protein likely to be given to infants that are not weaned on cow's milk.

Furthermore, milk, like other products of evolution, is a compromise. Mothers are not expendable. A species would not long survive if mothers depleted their own proteins so much in the course of feeding the first child that the prospects of later children were seriously jeopardized. Human milk is no doubt a good food, but the assumption that it is necessarily ideal is stretching belief in the beneficence and perfection of Nature too far.

When considering nutritional statements, apart from statements that depend on observation, we should also consider______.

A.the strange low-protein diet

B.the unusual character of the observer

C.the unexpected meals provided by the observer

D.the ample rations of the 1914 - 1918 war

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第6题
&8226;Read the article below about telecommunications.&8226;Choose the best sentence from

&8226;Read the article below about telecommunications.

&8226;Choose the best sentence from the opposite page to fill each of the gaps.

&8226;For each gap 8-12, mark one letter (A-G) on your Answer Sheet.

&8226;Do not use any letter more than once.

THE CUSTOMER MAY NOT RING TWICE

Companies spend large sums of money on their telephone systems, but then use them to create the wrong image, according to Ben Lambert, International Performance Manager at a company called Octopus. He claims that many companies have an average response time of 17 seconds Some can take as long as 24 seconds to answer the phone. 'At one time you had to dial the number and wait for the exchange or an operator to connect you. You were aware that it was probably going to take time and if no-one picked up the phone you would probably hang on for 20 rings,' he says. 'Now you bang in the numbers and the phone rings at the other end almost before you have finished. (8) Unless it is vital to get through, you are rarely prepared to wait as long as 24 seconds. In fact, the average response time should be five to ten seconds.'

Telephonists are one of the main interfaces with the public and customers. They give the first impression of the company and by definition you get only one chance to make a first impression. The facilities manager should know the fastest response time to the telephone, the slowest response time and the average response time. Mr Lambert points to a television advertisement by a leading bank that promised an answer within four rings. (9) 'Banks are trying to promote themselves as service providers and this advertisement gave a very powerful message,' says Mr Lambert.

Octopus estimates that telecommunications is the most expensive support service in offices, costing on average £1,000 per employee each year. (10) Given the changes over the past ten years, the cost of communicating is likely to continue to rise. In 1986, the typical office worker had just a simple push-button, or even dialling, handset. Now the traditional desk-based telephone also has voice mail and direct dialling and the staff member relies increasingly on email, paging, video- conferencing, on-line business seduces and mobile phones. Mr Lambert says, 'Such is the importance of all this to regions and economies generally that cities are increasingly looking on communications as the key infrastructure issue. (11) They are becoming as important, if not more so, than physical communications.' Telephony can sometimes get too sophisticated, though. Some American companies, for example, are refusing to install automatic answering systems that tell callers to dial extension numbers. (12) This gives the opposite impression to the one that companies would like to project.

A This was a very simple strategy that created a new performance measure.

B Considering the cost of facilities, better systems are out of the question.

C You expect an equally quick response.

D Atlanta, for example, used the Olympic games as an opportunity to become one of the best places in the world for multimedia communications.

E In many cases these are left on all day and the caller is passed automatically from one office to another.

F It is second only to wages within the average company budget.

G He claims that many companies have an average response time of 17 seconds for incoming calls.

(8)

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第7题
A.thinkingB.consideringC.longingD.counting

A.thinking

B.considering

C.longing

D.counting

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第8题
【填空题】The two important problems for VLC considering the illumination constrains are ________ and____________.
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第9题
Considering inflation, the nominal interest rate relevant for money demand is r + Ep.
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第10题
A. if B. supposing C. considering D. in order that

A. if

B. supposing

C. considering

D. in order that

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