On the past few days, two nations with large numbers of AIDS-infected people have announced plans to distribute a triple cocktail of life-prolonging antiretroviral drugs free to all who need it. China has been treating 5,000 patients and plans to expand the program to cover everyone in the country. South Africa’s cabinet approved a plan that includes drugs for all who need them.
China spent years denying it had an AIDS problem. Until recently, South Africa’s top officials minimized the epidemic, questioned whether H. I. V. was the cause of AIDS and labeled antiretroviral drugs "poisons". Both countries have now taken a courageous and essential step.
But only one is likely to succeed. Indeed, China’s program is already failing. One in five Chinese who have received antiretroviral drugs has already stopped taking them, which can lead to the creation of drug-resistant strains of the virus. China has only about 100 doctors nationwide with e
A. criticize.
B. abort.
C. depreciate.
D. disregard.
On the past few days, two nations with large numbers of AIDS-infected people have announced plans to distribute a triple cocktail of life-prolonging antiretroviral drugs free to all who need it. China has been treating 5,000 patients and plans to expand the program to cover everyone in the country. South Africa’s cabinet approved a plan that includes drugs for all who need them.
China spent years denying it had an AIDS problem. Until recently, South Africa’s top officials minimized the epidemic, questioned whether H. I. V. was the cause of AIDS and labeled antiretroviral drugs "poisons". Both countries have now taken a courageous and essential step.
But only one is likely to succeed. Indeed, China’s program is already failing. One in five Chinese who have received antiretroviral drugs has already stopped taking them, which can lead to the creation of drug-resistant strains of the virus. China has only about 100 doctors nationwide with e
A. worried.
B. indifferent.
C. optimistic.
D. frustrated.
Text 4
Over the past few decades, there has been a considerable increase in the use of mathematical analysis, both for solving everyday problems and for theoretical developments of many disciplines. For example, economics, biology, geography and medicine have all seen a considerable increase in the use of quantitative techniques. Twenty years ago applied mathematics meant the application of mathematics to problems in mechanics and little else--now, applied mathematics, or as many people prefer to call it, applicable mathematics, could refer to the use of mathematics in many varied areas. The one unifying theme that these applications have is that of mathematical modeling, by which we mean the construction of a mathematical model to describe the situation under study. This process of changing a real life problem into a mathematical one is not at all easy, we hasten to add, although one of the overall aims of this book is to improve your ability as a mathematical mod
A. Many books have been written on the topic of mathematical, modeling these years
B. Books devoted to mathematical modeling usually pay special attention to modeling formulation
C. The book introduced here does not claim that it had the best methods for teaching how to deal with real problems
D. The book introduced here takes the mastery of model formulation as its main purpose
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