in the world on your computer.accessing the information will no longer depend on the power of your computer.the idea is that while you access information，you will also have ‘access to the power of the bigger computer stations.
4 one advantage of this revolutionary idea is that geographical location will become irrelevant.the“grid”will decide which are the best parts of a worldwide network to do the job you want.this means that you may be accessing a computer in japan to solve a problem in alaska.
5 the“grid”can be compared to having an efficient personal assistant.you can gave your assistant a task and“he”will do it for you.the assistant will do the preliminary research，collect the data，compare them and decide on the best course of action by accessing any of the computer centers in the “grid” that happen to have the relevant information.ail you have to do is assign the task，sit back and wait.
6 at present.possible applications of the“grid”in scientific research are being explored.while it has taken about fifteen years for internet use to become widespread， experts believe that the “grid” could be us and running for private individuals far more quickly.scientists working“grid’’projects are convinced that it will be as widely used as the web in the next ten years.
23 paragraph 2____________
24 paragraph 3____________
25 paragraph 4____________
26 paragraph 5____________
a how does the “grid” work?
b power shared
c just make a request
d limitations of present internet use
e distance is not a problem
f a new era for the internet
27 traditionally the power of your computer determines how fast you can access____________
28 the “grid” will enable you to get on your computer the power of___________
29 the “grid” would be like____________ who can perform your tasks efficiently
30 it is believed that the widespread use of the “grid” will become possible in the next__________
a the bigger computer stations
b the advantage
c ten yearsｅxamda
d information
e your personal assistant
f fifteen years
第4部分：阅读理解(第31—45题，每题3分，共45分)
下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。
第一篇sunspots
it's not surprising that sunspots(太阳黑子)were observed by ancient astronomers (天文学家).the largest soupspoon the sun can be seen without a telescope.it was not until the invention of the telescope(望远镜)in the early 17th.century，however，that systematic studies of sunspots could be undertaken.the great astronomer galileo was among the first to make telescopic observations of sunspots
sunspots are regions of extremely strong magnetic fields(磁场)found on the sun’s surface.a sunspot has a dark central core known as the umbra.the umbra is surrounded by a dark ring called the penumbra，where the magnetic field spreads outward.sunspots appear dark because they are giving off less radiation.they are cooler than the
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