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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 modeler. Th
A. be more proficient in mastering mathematical knowledge
B. be more proficient in applying his mathematical knowledge to real problem solving
C. have a better understanding of the various uses of mathematical models
D. fined real excitement and satisfaction in solving problems

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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. reads it carefully
B. understands the general concept it provides
C. C .reads Section Ⅰ and Ⅱ as well
D. tries to solve the problems provided in Sections Ⅰ and Ⅱ

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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 modeler. Th
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

[单项选择]Over the past few years, first radio, and now television, have shown the ______ public, who are after all the electorate, what in fact ______ when government bills are discussed and questions are asked.
A. average; turns up
B. ordinary; comes up
C. general; goes on
D. normal; lets on

[单项选择](Over) (the past) few years, medical researchers (are searching) for a means (to control) AIDS virus
A. Over
B. the past
C. are searching
D. to control

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Passage Four For some time past it has been widely accepted that babies and other creatures learn to do things because certain acts lead to" rewards"; and there is no reason to doubt that this is true. But it used also to be widely believed that effective rewards, at least in the early stages, had to be directly related to such basic physiological "drives" as thirst or hunger. In other words, a baby would learn if he got food or drink or some sort of physical comfort, not otherwise. It is now clear that this is not so. Babies will learn to behave in ways that produce results in the world with no reward except the successful outcome. Papousek began his studies by using milk in the normal way to "reward" the babies and so teach them to carry out some simple movements, such as turning the head to one side or the other. Then he noticed that a baby who had had enough to drink would refuse the milk but would still go on making the learned response w
A. have the lights turned on
B. be rewarded with milk
C. please their parents
D. be praised

[单项选择]In the past few years the school has _____ a lot of money improving the teaching equipment.
A. cost
B. paid
C. spent
D. taken

[单项选择]The past decade has been the warmest for 1,000 years, according to a(n) ________of ice cores drilled from a glacier(冰川) in the Himalayas.
A. analogy
B. analysis
C. anniversary
D. appendix

[单项选择]For the past few years Susan had been _______ her income by the creation of fiction under a pen name.
A. extending
B. magnifying
C. exceeding
D. supplementing