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【单选题】
下图中四幅坐标图像是有关生物的生理过程的描述，下列针对这四幅图像的叙述不正确的是（）A.
图1中光强度为B时光合作用强度与呼吸作用强度相等
B.
图2中氧气浓度为B点对应值时植物既不进行有氧呼吸也不进行无氧呼吸
C.
图3中A曲线可表示胃蛋白酶；B曲线可表示胰蛋白酶
D.
图4中A曲线表示变温动物；B曲线表示恒温动物
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