题目

如图，的顶点B在矩形AEFC的边EF上，点B与点E、F不重合．若△ACD的面积为3，则图中的阴影部分两个三角形的面积和为______. 答案：解析：3   ∵△ACD的面积为3           ∴△ACB的面积为3           ∵△ACB的面积矩形AEFC的面积的一半     ∴阴影部分两个三角形的面积和=矩形AEFC的面积-△ACB的面积=3。 考查知识：平行四边形、矩形的性质20．The summer Museum in Philadelphia houses one exhibit near the entrance that inspires unmatchable awe．Look closely at the display，and you can see marks left by museum goers pressing their foreheads against the glass．The object that fascinates them is a small wooden box containing 46 microscope slides，each displaying a slice of Albert Einstein's brain．A magnifying glass positioned over one of the slides reveals a piece of tissue about the size of a stamp．Einstein's brain represents potential，the ability of one exceptional mind，one genius，to catapult ahead of everyone else．Throughout history rare individuals have stood out for their meteoric contributions to a field．Lady Murasaki for her literary creation．Michelangelo for his masterful touch．Marie Curie for her scientific acuity．"The genius，"wrote German philosopher Arthur Schopenhauer，"lights on his age like a comet into the paths of the planets．"Consider Einstein's impact on physics．With no tools available other than the force of his own thoughts，he predicted in his general theory of relativity that massive accelerating objects---like black holes orbiting each other-would create ripples（波纹）in the fabric of space-time．It took one hundred years，enormous computational power，and massively sophisticated technology to definitively prove him right，with the physical detection of such gravitational waves less than two years ago．Einstein revolutionized our understanding of the very laws of the universe．But our understanding of how a mind like his works remains stubbornly stagnant．What set his brainpower，his thought processes，apart from those of his merely brilliant peers？What makes a genius？Philosohers have long been puzzling over the origins of genius．Early Greek thinkers believed an overabundance of black bile-one of proposed by Hippocrates-endowed poets，philosophers，and other famous souls with"extraordinary powers，"says historian Darrin McMahon，author of Divine Fury：A History of Genius．Phrenologists（骨相学家）attempted to find genius in bumps on the head； they collected skulls-including philosopher Immanuel Kant's-which they examined，measured，and weighed．None of them discovered a single source of genius，and such a thing is unlikely to be found．Genius is too abstract，too subjective，too wedded to the verdict of history to be easily identified．And it requires the ultimate expression of too many features to be simplified into the highest point on one human scale．Instead we can try to understand it by cracking the complex and mixed qualities-intelligence，creativity，perseverance，and simple good fortune，to name a few-that combine to create a person capable of changing the world．58．Why does the author talk about the"marks"in paragraph ONE？CA．He is unsatisfied with the untidy environment of the museumB．He is angry about the disrespect to the exhibitC．He is about a explain the exhibit's popularityD．He is amazed at the huge population visiting the museum59．What can be inferred from Paragraph？CA．It took Einstein years to prove the existence of gravitational waves．B．Arthur Schopenhauer was widely acknowledged as a genius in historyC．Einstein made incredible prediction despite lack of sourcesD．Geniuses have limited influences just as comets do60．What is the author most likely to talk about after this passage？BA．Examples of geniuses who possess such qualitiesB．Importance of such qualities in becoming a geniusC．Ways to combine qualities with good fortuneD．Means to make a genius．