看图回答问题。

1. Is this a refrigerator or a stove?

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2. Are these dishes clean or dirty?

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3. Where's the toilet?

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4. What is Mr. Smith doing?

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5. Is this a bathtub or a shower?

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1.2.       3.   

4. 5.

玉米的根系属于直根系，而水稻的根系属于须根系。