Deserts, dry areas with no vegetation, cover more than one-third of the Earth's land surf

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A. surprisingly
B. eventually
C. permanently
(答案→)D. virtually
解析：　virtually(=almost, very nearly; in every way that is really important)几乎，事实上，实际上；My book is virtually finished; I have only a few changes to make in the writing.( 我的书几乎写完了,我只要在作品中再作一点修改就可以了。)surprisingly令人惊奇的；eventually最终的；permanently永久的。