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【单选题】
蝗虫是农作物的头等害虫，干旱往往伴随着蝗灾，即“旱极必蝗”．蝗灾发生时，蝗群迁飞遮天蔽日，声震数里，所到之处，绿色植物被啃食殆尽，转眼便成为不毛之地．蝗虫的下列形态结构不是与上述生活习性相适应的是（ ）A.
身体分为头、胸、腹三部
B.
中胸和后胸上各生有一对翅
C.
身体表面具有坚硬的外骨骼
D.
具有咀嚼式口器
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