阿摩線上測驗
7. A characteristic of the circulatory system of arthropods is
(A) lack of a heart.
(B) lack of blood.
(C) lack of blood vessels.
(D) lack of distinction between blood and interstitial fluid.
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統計： A(0), B(0), C(0), D(2), E(0) #3240204
統計： A(0), B(0), C(0), D(2), E(0) #3240204
