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  Walking through the woods alone can be a frightening prospect for a kid, but not for 7-year-old Matthew of Portland, Oregon. He doesn’t have a backyard to (56)_____ in, so the woods behind his house serve the same (57)_____. He spends hours out

  Walking through the woods alone can be a frightening prospect for a kid, but not for 7-year-old Matthew of Portland, Oregon. He doesn’t have a backyard to (56)\_\_\_\__ in, so the woods behind his h

Passage 1Questions 1 to 5 are based on the following passage.  In 1866, sailors on a German ship called Paula threw a bottle with a message into waters hundreds of miles off the western coast of Australia. One hundred and thirty-one years later, (76) the

Passage 1Questions 1 to 5 are based on the following passage.  In 1866, sailors on a German ship called Paula threw a bottle with a message into waters hundreds of miles off the western coast of Austr

Passage 3Questions 11 to 15 are based on the following passage:  Chokwe Selassie is on a mission to help drivers avoid potholes(路面坑洼). The Eight-grader was inspired to kick off his mission on a recent morning, when his mother was driving him to school. Th

Passage 3Questions 11 to 15 are based on the following passage:  Chokwe Selassie is on a mission to help drivers avoid potholes(路面坑洼). The Eight-grader was inspired to kick off his mission on a recent

Passage 1  Almost every family buys at least one copy of a newspaper every day. Some people subscribe(订阅) to as many as two or three newspapers. But why do people read newspapers?  Five hundred years ago, news of important happenings—battles lost and won,

Passage 1  Almost every family buys at least one copy of a newspaper every day. Some people subscribe(订阅) to as many as two or three newspapers. But why do people read newspapers?  Five hundred years

Passage 3Questions 11 to 15 are based on the following passage.  The word science is heard so often in modern times that almost everybody has some notion of its meaning. On the other hand, its definition is difficult for many people. (79) The meaning of t

Passage 3Questions 11 to 15 are based on the following passage.  The word science is heard so often in modern times that almost everybody has some notion of its meaning. On the other hand, its definit

Incomplete information system and rough set theory : Models and attribute reductions : 模型与属性约简 | 不完备信息系统与粗糙集理论 : 模型与属性约简.pdf

本书主要介绍粗糙集理论及其在不完备信息系统中的拓展。粗糙集理论是用于处理不精确问题的数学理论,是经典集合论的重要发展。由于粗糙集理论建立在等价关系的基础上,因而不能用来处理具有未知属性值的不完备信息系统,因而如何在不完备信息系统中扩展粗糙集的相关概念对于粗糙集的发展具有极其重要的