[单项选择]Why were there few jurisdictional disputes over international waters until the mid-twentieth century
A. No nation had the right to regulate coastal activities for innocent purposes.
B. All nations shared equal right and responsibility for international waters.
C. Few standards of conduct could be applied to activities in international waters.
D. Most nations did not establish rules for management or protection of their territorial waters.

[单项选择]The reason why few airlines want to impose a total ban on their passengers using electronic devices is ______.

[单项选择]As soon as the exams were over, the students all went their ______ ways.
A. homely
B. perspective
C. respective
D. diverted

[单项选择]Jim {{U}}reckoned{{/U}} that we were only a few miles from our destination when our car broke down.
A. estimated
B. figured
C. realized
D. assessed

[单项选择]Tile student said there were a few points in the essay he ______ impossible to comprehend.
A. has found
B. was finding
C. had found
D. would find

[单项选择]The student said there were a few points in the essay he ______ impossible to comprehend.
A. had found
B. will arise
C. arose
D. have arisen

[单项选择]Why so few people are left-handed ______.
A. has nothing to do with heredity
B. is not known by scientists
C. has little to do with the working of their brains
D. is that left-handers are mainly twins

[单项选择]

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]Why were two rail companies fined


A. Because they asked young students to work at night.
B. Because their train was not safe.
C. Because they hired college students illegally.
D. Because their work practice system was unsafe.

[单项选择]Why do only few pilots retire early


A. Because pilots are much needed in the airline industry.
B. Because the economy is gloomy.
C. Because the cost of training a pilot is high.
D. Because pilots can not do other jobs.

[单项选择]The reason why so few are left-handed ______.
A. has nothing to do with heredity
B. remains one of the great unsolved mysteries of science
C. has little to do with the working of their brains
D. is that left-handers are mainly twins

[单项选择]Why were the couple detained


A. Because of gem theft.
B. Because of robbery.
C. Because they are spy.
D. Because of money cheating.

[单项选择]Why were the couple frustrated
A. Their dog was not feeling very well.
B. They were trying to sell their house but failed.
C. Their financial position was not on the right track.
D. They had bank loan to pay off.

[单项选择]Over the last few months hardly a day had gone by without ______ in the financial press.
A. his name was mentioned
B. his name mentioned
C. his name to be mentioned
D. his name being mentioned

[单项选择]

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. solving problems in real life with mathematics
B. the application of mathematics in problems related to mechanics
C. its ability to describe various situations
D. the construction of mathematical modeling