Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase for each of the numbered blanks.
An ecosystem is a community of animals, plants and microbes that sustain themselves in the same area or environment by performing the activities of living, feeding, reproducing and interacting. Like many of Africas large mammals, giraffes have (46)______ in numbers and in range over the last century. At one time, herds of over 100 animals were common in savanna regions across the continent, however, today concentrations like these exist only in East Africa particularly Tanzania Serengeti National Park.
The decline of giraffe populations has largely been due to hunting. In Africa, the giraffe is a traditional source of hide and hair and also of tough but (47)______ meat. The hunting of giraffes has not yet had a catastrophic effect, (48)______ on some of Africas big-game animals, but it is a cause for concern. The natural habitat of the giraffe is also being impacted more and more by human activities, (49)______ the animals range. The giraffe is currently a protected species throughout most of its range and is classed as conservation-dependent by the World Conservation Union. The giraffe’s prospects for survival are good for (50)______ living in national parks and game reserves, but for animals living outside these areas the future is less secure.
(49)______




A.extending
B.providing
C.reducing
D.controlling

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Read the following passage and mark the letterA, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
Researchers in the field of psychology have found that one of the best ways to make an important decision, such as choosing a university to attend or a business to invest in, involves the utilization of a decision worksheet. Psycholosists who study optimization compare the actual decisions made by people to theoretical ideal decisions to see how similar they are. Proponents of the worksheet procedure believe that it will yield optimal, that is, the best decisions. Although there are several variations on the exact format that worksheets can take, they are all similar in their essential aspects.
Worksheets require defining the problem in a clear and concise way and then listing all possible solutions to the problem. Next, the pertinent considerations that will be affected by each decision are listed, and the relative importance of each consideration or consequence is determined. Each consideration is assigned a numerical value to reflect its relative importance. A decision is mathematically calculated by adding these values together. The alternative with the highesl number of points emerges as the best decision.
Since most important problems are multi-faceted, there are several alternatives to choose from, each with unique advantages and disadvantages. One of the benefits of a pencil and paper decision-making procedure is that it permits people to deal with more variables than their minds can generally comprehend and remember. On the average, people can keep about seven ideas in their minds at once. A worksheet can be especially useful when the decision involves a large number of variables with complex relatiohships. A realistic example for many college students is the question “What will I do after graduation?” A graduate might seek a position that offers specialized training, pursue an advanced degree, or travel abroad for a year.
A decision-making worksheet begins with a succinct statement of the problem that will also help to narrow it. It is important to be clear about the distinction between long-range and immediate goals because long-range goals often involve a different decision than short-range ones. Focusing on long-range goals, a graduating student might revise the question above to “What will I do after graduation that will lead to a successful career?”
Note:
- multi-faceted (adj): having many different parts.
What does the passage mainly discuss?




A.A tool to assist in making complex decisions.
B.A comparison of actual decisions and ideal ones.
C.Research on how people make decisions.
D.Differences between long-range and short-range decision making.