Over the next decade or so a new global middle class will emerge, with estimates of its size v（变化） from 1.2 billion to 4 billion people.

1. Over the next decade or so a new global middle class will emerge, with estimates of its size v（变化） from 1.2 billion to 4 billion people.

【考点】

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【答案】

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单词拼写（单句）未知普通