26. What is one of the most frightening threats of global warming according to the passage?
27. What did scientists disagree on?
28. What is the latest information revealed about the West Antarctic ice sheet?
29. What the scientists latest findings suggest?
第二篇
Its always fun to write about research that you can actually try out for yourself.
Try this: Take a photo and upload it to Facebook, then after a day or so, note what the URL link to the picture is and then delete it. Come back a month later and see if the link works. Chances are: It will.
Facebook isnt alone here. Researchers at Cambridge University have found that nearly half of the social networking sites dont immediately delete pictures when a user requests they be removed. In general, photo-centric websites like Flickr were found to be better at quickly removing deleted photos upon request.
Why do deleted photos stick around so long? The problem relates to the way data is stored on large websites: While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution. Its a complex system wherein data is copied to multiple intermediate devices, usually to speed up access to files when millions of people are trying to access the service at the same time. But because changes arent reflected across the content delivery networks immediately, ghost copies of files tend to linger for days or weeks.
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