【单选题】【消耗次数：1】
植物体上不具有刺的树种是（ ）
①
A小檗
②
B龙牙花
③
C火棘
④
D鹅掌楸
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植物细胞是构成植物体的[填空(1)]和[填空(2)]单位。
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none
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must;can;must;his
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may;can;must;him
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can;must;can;him
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