According to Oxford English Dictionary, book is ""a written or printed treatise or series of treatises, occupying several sheet

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问题     According to Oxford English Dictionary, book is ""a written or printed
treatise or series of treatises, occupying several sheets of paper or other
substance fastened together so as to compose a material whole"". Books are
among the most powerful instrument man has created. In them, knowledge 【M1】______
and ideas may be preserved intactly despite the passage of time or the ef- 【M2】______
fects of wars and atural disasters.
    In addition to serve as sources of knowledge and tools of 【M3】______
learning, books have long been valued for the pleasure and en
tertainment they provide for. In early times, books consisted of 【M4】______
inscribing clay tablets, rolls of papyrus, sheets of parchment, or other ma- 【M5】______
terials. Modern books consist of printed pages bound between protective
covers. The earliest survived works that may be classified as books were 【M6】______
produced in Egypt and Mesopotamia (modern Iraq) about 5,000 years ago.
The wedge-shape letters characteristic of cuneiform script was pressed into 【M7】______
the damp clay. Gradually papyrus scrolls replaced the clay tablets because
of the Aramaic language, which could not easily be transcribed in cuneiform
characters. Papyrus scrolls were made of flat strips cut from the stem of the 【M8】______
papyrus plant. The strips were pasted together to form long sheets. A stick
was attached to each end of the sheet, which was then wounded up to form 【M9】______
a scroll. The papyrus could be easily carried and stored, and it was poor for 【M10】______
preserving records. Eventually parchment (the specially prepared skill of an
animal, usually a sheep or a goat) replaced papyrus as a writing material.
【M1】

选项

答案instrument — instruments

解析 注意前一行中的“among”一词暗示了“instrument”应该用复数。
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