42. Where do air-breathing insects carry out gas exchange?
(A) in specialized external gills.
(B) in specialized internal gills.
(C) in the alveoli of their lungs.
(D) across the membranes of cells.
(E) across the thin cuticular exoskeleton.

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統計： A(6), B(6), C(6), D(22), E(13) #1118774

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open circulatory sys...
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