计算机病毒是一种 ( )。A．微生物感染 B．电磁波污染 C．程序 D．放射线

关于肺叶影像解剖的叙述，错误的是（）

A.左肺由斜裂分为上、下二叶

B.后前位胸片不能显示水平裂

C.左侧位胸片左上肺叶位于斜裂的前方

D.左侧位胸片左下肺叶位于斜裂的后方

E.后前位胸片右上肺叶的下界易于显示

双乳剂X线胶片结构中，不包括

A．片基

B．保护层

C．底层

D．乳剂层

E．防反射层

C

　　The curtain on the 2008 US presidential election finally rose last month as Requblican Senator(参议员) John McCain and Democratic Senator Barack Obama were formally selected as candidates of the two major parties.This may be one of the hardest decisions voters have to make between two appealing candidates.The big question for voters,as they face both an economic downturn and international threats,is :who will they elect? A young first - term senator promising change and new ideas,or a longtime senator with strong military experience and a reputation as a maverick(特立独行的人)？

　　American voters have never seen a candidate quite like Obama.He has a white mother from the US and a black fater from Kenya who left the family when Obama was very young.He spent part of his youth in Indonesia.

　　However,McCain has a very different life story.

　　He grew up in a Navy family and was a daring pilot during the Vietnam War in the 1960s. When Obama was in kindergarten in Indonesia,McCain's plane was shot down over Ietenam and he became a prisoner of war.McCain could have been set free if he disowned America but he refused and so was held for five years.

　　"We need a president who is very,very old,"McCain joked at his age as many others do.If elected,he would be 72 when he takes office and the oldest man to step in.

　　So in the end,the election may depend on several factors that are hard to judge:Will Obama's race matter to a significant number of voters ? Will workingclass whites who tended to support his primary (党内初选) oponent,Hillary Clinton,vote for Obama? And perhaps most important of all,will uncertain voters be more attracted to Obama's vision or to McCain's experience?

　　Whatever happens,one thing is clear,however:Whoever walks into the White House on January 20,2009,will find huge challenges waiting for him in the Oval Office,both at home and abroad.

　　64.______makes the result of the election hard to predict.

　　　A.Whether working class whites care about Obama's inexperience

　　　B.The economic trouble the country now faces

　　　C.Who uncertain voters will finally decide to vote for

　　　D.McCain being too old to govern the country

　　65.The appeal in Obama as a presidential candidate lies in _________

　　　A.his multi - cultural background

　　　B.his belife in tradition

　　　C.his inexperience in politics

　　　D.his fantastic promises

　　66.The word "disown" in Paragraph 6 means closest to ______.

　　　A.flee from

　　　B.turn his back on

　　　C.not keep it private

　　　D.expose secrets about

　　67.The challenges that will face the new preident______.

　　　A.are not mentioned in the text

　　　B.include buklding a strong party and a friendly image

　　　C.refer to the problems of immigrants and economy

　　　D.refer to the problems of economy amd international relations

For nearly ten years,the Unified Modeling Language (UML) has been the industry standard for visualizing,specifying,constructing,and documenting the(1)of a software-intensive system.As the(2)standard modeling language,the UML facilitates communication and reduces confusion among project(3).The recent standardization of UML 2.0 has further extended the language's scope and viability.Its inherent expressiveness allows users to(4)everything from enterprise information systems and distributed Web-based applications to real-time embedded systems. 　　

The UML is not limited to modeling software.In fact,it is expressive enough to model (5)systems,such as workflow in the legal system,the structure and behavior of a patient healthcare system,software engineering in aircraft combat systems,and the design of hardware. 　　

To understand the UML,you need to form a conceptual model of the language,and this requires learning three major elements:the UML's basic building blocks,the rules that dictate how those building blocks may be put together,and some common mechanisms that apply throughout the UML.

空白（1）处应选择（）

A.classes

B.components

C.sequences

D.artifacts

在账务系统中，对结算方式进行没置的目的主要是( )。

A．便于对票据管理

B．便于进行银行对账

C．便于进行记账

D．便于进行编号