In early times, book consisted of inscribed clay tablets, rolls of papyrus, 【M1】______ sheets of parchment, or other materials.

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问题     In early times, book consisted of inscribed clay tablets, rolls of papyrus, 【M1】______
sheets of parchment, or other materials.
    Modern books consist of printed pages bounded between protective cov- 【M2】______
ers. The earliest survival works that may be classified as books were pro- 【M3】______
duced in Egypt and Mesopotamia (modern Iraq) about 5,000 years ago.
    The wedge-shaped letters characteristics of cuneiform script was pressed into the 【M4】______
damp clay. Gradually papyrus scrolls replaced the clay tablets because of Aramaic lan- 【M5】______
guage, which could not easily be transcripted in cunei- 【M6】______
form words. Papyrus scrolls were made from flat strips cut 【M7】______
from the stem of the papyrus plant. The strips were pasted together
to form long sheets. A stick was attached to every end of the sheet, 【M8】______
it was then wound up to form a scroll. The papyrus could be easily carried and stored, 【M9】______
and it was poor for preserving records. Eventually parchment replaced pa- 【M10】______
pyrus as a writing material.
【M2】

选项

答案bounded — bound

解析 bind和bound两个动词极易混淆:bind作动词表“镶边,装订”,它的过去式和过去分词为bound,因此此处应为bound。至于动词bound则表示“跳跃,限制”,它的过去时和过去分词为bounded。注意不要将两词混为一谈。
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