将下列句子改成单数形式。（注意冠词的使用）
1. Are there any oranges on the table?
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2. These are old houses.
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3. Are these elephants or bees?
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4. Those are pictures of animals.
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【考点】不定冠词（a，an）,单数名词,指示代词,系动词,there be 句型

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