摘要： D. 水渗透下来以后.泥土中有机质和其他物质和水按常识是和水混在一起.然后分解.看出答案. 基础写作参考范文] The mouse is a most effective device used by people to communicate with a computer． For most people, it’s almost impossible to operate a computer without a mouse, let alone surf the Internet. A well-chosen mouse, which is really handy, flexible and convenient in controlling the screen, enables us to edit text, browse web page and download what we want ,with the functions of inserting, deleting, moving and copying. It can even bring us a flood of music, movies and PC games. However, relying too much on mouse clicking makes us lazier and less creative both mentally and physically. Too much ready information on our fingertips leaves little room for knowledge pursuing and too many ready answers make us less excited in finding truth.

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