2. 外语
  3. For convenience it is common to speak of plants as "herbs," "shrubs," and "trees," but it is really no sharp distinctions among

For convenience it is common to speak of plants as "herbs," "shrubs," and "trees," but it is really no sharp distinctions among

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问题 For convenience it is common to speak of plants as "herbs," "shrubs," and "trees," but it is really no sharp distinctions among them.
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答案it-there
解析 译文：出于方便人们通常把植物说成草、灌木和树，但其实它们之间没有明显区别。
分析：考查there be句型。此处it并不代指句中任何成分，也不是形式主语，因为后文并无真正的主语部分，故it应改为there。
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