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【简答题】
In the computer age, most of us take a broadband(宽带)Internet connection for granted. Whether cable or mobile broadband, today’s connections are many times faster than those in the early days. Videos play smoothly, complex websites load quickly, and files download much faster than ten years ago. And the files are much bigger too. There’s a catch , of course: You have to live near enough to a major city to get broadband Internet. If you don’t, it’s slow dial-up access for you. And for those living really far out, there may be no Internet access at all. Technology experts often talk about the “last mile” problem, which refers to the difficulty of bringing Internet access to remote locations. In cities and suburbs, it’s relatively easy to provide access for everyone. It is much more difficult to deliver access to those living far from cities, especially in developing countries. Internet service providers, for their part, have been reluctant to provide access to sparsely (稀疏地) populated areas. The handful of Internet users they would reach wouldn’t cover the expense. But every year, technological advancements allow of more and more Internet users. Most broadband connections today run over existing cable TV and telephone lines although these technologies aren’t available everywhere. Some companies have delivered the Internet over standard power lines. Advancements in cheaper, more efficient fiber optics cables (光纤电缆) promise to bring extremely fast Internet connections to more users. Still, the “last mile” problem remains hard to deal with. There will always be somewhere that doesn’t have an affordable broadband connection. But someday that might not matter. If the rapid progress in cell phone technology is any indication (迹象), it may not be too long before an Internet connection simply follows you wherever you go. 小题1:The underlined part “a catch” (in Paragraph 2) probably means “_____”. A.a rare challenge B.a desirable plan C.an efficient device D.a hidden problem 小题2:What can we know from the third paragraph? A.Internet connection has not been popular in most cities. B.Internet service providers care about rural(农村的)customers. C.Computer is popular in developing countries. D.It is hard to bring Internet access to users in remote areas. 小题3:Paragraph 4 mainly tells us that technological advancements _____. A.make TV and telephone available everywhere B.bring great change to people’s everyday life C.make it possible for more people to use the Internet D.bring faster Internet connections to users 小题4:What may eventually settle the “last mile” problem? A.The broadband connection’s getting faster. B.More and more Internet users. C.more and more Internet connections. D.The rapid progress in cell phone technology.
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【判断题】PID调节系统中由于微分调节器的作用,该系统较比例积分系统具有更强的克服动态偏差的能力。
A.
正确
B.
错误
【单选题】超滤膜是分离膜技术中的一部分,它是介于微滤和纳滤之间的一种膜过程,笼统地讲,超滤膜孔径在( )之间
A.
1nm~0.1μm
B.
0.1nm~0.1μm
C.
1nm~1μm
D.
0.1nm~0.1μm
【判断题】PID调节系统中由于微分调节器的作用,该系统较比例积分系统具有更强的克服偏差的能力。
A.
正确
B.
错误
【判断题】框架填充墙墙顶宜用实心粘土砖直砌砌筑与横梁底挤紧。
A.
正确
B.
错误
【单选题】下列心脏病中,那项最容易在术中发生心跳骤停( )
A.
高血压性心脏病
B.
风湿性心脏病
C.
冠状动脉硬化性心脏病
D.
先天性心脏病(非发绀型)
E.
以上都是
【单选题】- je voudrais une chambre ____ deux lits.
A.
à
B.
de
【单选题】下列心脏病中,那项最容易在术中发生心跳骤停
A.
高血压性心脏病
B.
风湿性心脏病
C.
冠状动脉硬化性心脏病
D.
先天性心脏病(非紫绀型)
E.
以上都是
【单选题】Je voudrais une table ________ terrasse.
A.
à la
B.
en
C.
au
D.
chez
【单选题】超滤过滤的滤膜孔径( )
A.
0.02~10µm
B.
<20nm
C.
0.03~2µm
D.
<1nm
【简答题】用微孔滤膜滤过除菌,薄膜滤材的孔径一般不超过
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