| Idx | 2144 |
|---|---|
| Keyword | pollution |
| Type of Sentence | ✗ |
| Error Sentence | The world's most serious ecological problem is the pollution. |
| Correct Sentence | The world's most serious ecological problem is pollution. |
| Cloze Error Sentence | The world's most serious ecological problem is [[the]] pollution. |
| Cloze Sentence | The world's most serious ecological problem is [[ ]] pollution. |
| Cloze Answer | _ |
| Choices | _ | the |
| Explanation | See THE 4 (↑ |
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