题目内容
The word "isolated" underlined in Paragraph 4 most probably means ______ .
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SECTION 3 Error Correction
This section consists of 15 sentences; in each sentence there is a part given in the brackets that indicates a grammatical error. Below each sentence, there are 4 choices respectively marked by letters A,B,C and D. Choose the word or phrase that can replace the part so that the error is corrected. There is only ONE right answer.
We learned that Columbus has discovered America in 1492.
The topic sentence of Paragraph 3 is ______ .
The word "it" underlined in Paragraph 3 most probably means ______ .
内在经济是指()。
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