6.A fly's wings are so thin that the veins show through.
(A)bones
(B)shoulder muscles
(C)ligaments
(D)blood vessels

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統計： A(7), B(9), C(12), D(254), E(0) #1412699

詳解 (共 1 筆)

#5587778
蠅的翅膀很薄，可以看到靜脈vein 靜脈...
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