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不对称合成（asymmetrical synthesis）
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The leaf， greyish green to brown green， thin fragile leaflets， lanceolate， mucronate， asymmetrical at the base.该叶的特征包括下列哪几项：（ ）。A．灰绿至棕绿色小叶B．叶片薄而易碎C．披针形叶D．卵圆形叶E．叶基不对称
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A typical application of this(71)is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 Kb/s～512 Kb/s in the reverse direction depending on the distance, 12 000 or 18 000 feet.. The different speed for each direction gives it the(72)label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user(73)a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL delivers high(74)where you need it and only uses a single copper pair. Through multiplexing, it also reserves(75)of the bandwidth for POTS.A．FTTHB．HFCC．FTTCD．HDSL
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（ ）,photo synthesis is the ultimate source of food for almost all organisms on earth.A.It is an extremely important process
B.An extremely important process,it is
C.That an extremely important as
D.An extremely important process
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Stars in Their EyesThe Scientific American Book of the Cosmos edited by David Levy,Macmillan，￡20,ISBN 0333782933Previous generations of scientists would have killed to know what we know.For the first time in history,we have a pretty good idea of the material content of the Universe,our position within it and how the whole thing came into being.In these times of exploding knowledge there is a definite need to take stock and assemble what we know in a palatable（受欢迎的）form._______ (46)The essays in The Scientific American Book of the Cosmos have been selected by David Levy,co-discoverer of Comet Shoemaker-Levy 9,which in 1994 struck Jupiter with the violence of several full-scale nuclear wars.________(47)This is certainly a great collection of essays,but it is not , as the book promises , a seamless（完美的，无缝隙的）synthesis of our current knowledge.Nobody can fault the range of articles Levy has included.There are essays on the planets, moons and assorted debris（碎片）in the Solar System , and on our Galaxy , the Milky Way. _______(48)The contributors,too,are stars in their own fields.Not many books can boast chapters written by such giants as Erwin Schrodinger and Francis Crick.My personal favorites are a piercingly clear essay by Albert Einstein on general relativity and an article by Alan Guth and Paul Steinhardt on the inflationary（膨胀的）Universe.So much for the book's content. But Levy has not succeeded in providing an accurate synthesis of our current knowledge of the cosmos,which the book jacket promises.Gathering together previously published articles inevitably leaves subject gaps,missing explanations and so on. ________(49)But there isn't one.In fact,surprisingly for a book so densely packed with information,there is no index.Collecting essays in this way is clearly a good publishing wheeze（巧妙的主意）.But this approach shortchanges the public,who would be better served by an account moulded into a seamless whole.________(50)However,for the next edition,please,please can we have an index?_______ (46)A: Tegmark fears he may hold the record for the longest time taken to read one book.B: In a more positive vein,this is a wonderful collection of essays to dip in and out of if you already have a good overview（概述）of current cosmic understanding.C: Levy is an active astronomer and an accomplished writer,so you'd expect him to provide a broad and accurate picture of our current understanding of the cosmos.D: Scientific American has attempted to cater to this need by bringing together essays that have appeared in the magazine.E: To some extent, these could have been plugged with a glossary（词表）of terms.F: Also included are contributions on the world of subatomic particles,the origin of life on the Earth and the possibility of its existence elsewhere.
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According to the passage，the end goal of great literature is( ) A.the recounting of dramatic and exciting stories，and the creation of character
B.to create anew a synthesis of life that illumines the human condition
C.the teaching of morality and ethical behavior
D.to write about tragedy and despair
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ADSL概述（）ADSL是英文“Asymmetrical Digital Subscriber Line”的缩写，中文翻译为：（），它是数字用户线（DSL）技术的一种，可在普通铜线电话用户线上传送（）业务的同时，向用户提供1.5~8Mb/s速率的数字业务，在上行、下行方向的传输速率（）。
考题
What characteristics make ADSL the likely choice among DSL technologies for Teleworker?（）A、most widely deployed by service providers B、provides asymmetrical bandwidth, including high speed downlinkC、data rate is affected by distance to the Central OfficeD、provides the furthest reach at T1 speeds E、supports connection of two routers without the use of a DSL access concentrator
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SDH全称为（）A、synchronous digital hierarchyB、synthesis digital hierarchyC、synchronously developed hierarchyD、synthesized development hierarchy
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SONET全称为（）A、synchronous optimized networkB、synchronous optical networkC、synthesis optimized networkD、synthesis optical network
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单选题A vessel continually lists to one side and has a normal rolling period. Which statement is TRUE?（）.A
The vessel has negative GMB
The center of gravity is on the centerlineC
The list can be corrected by reducing KMD
The vessel has asymmetrical weight distribution
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填空题ADSL概述（）ADSL是英文“Asymmetrical Digital Subscriber Line”的缩写，中文翻译为：（），它是数字用户线（DSL）技术的一种，可在普通铜线电话用户线上传送（）业务的同时，向用户提供1.5~8Mb/s速率的数字业务，在上行、下行方向的传输速率（）。
考题
多选题What characteristics make ADSL the likely choice among DSL technologies for Teleworker?（）Amost widely deployed by service providersBprovides asymmetrical bandwidth, including high speed downlinkCdata rate is affected by distance to the Central OfficeDprovides the furthest reach at T1 speedsEsupports connection of two routers without the use of a DSL access concentrator
考题
名词解释题DNA synthesis blocking (DNA 合成阻断法)
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