7. Which of the following is not a feature of insects?
(A) Book lung
(B) Malpighian tubules
(C) Open circulatory system
(D) Tracheal system
(E) Exoskeleton
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統計: A(38), B(0), C(1), D(10), E(0) #2993196
統計: A(38), B(0), C(1), D(10), E(0) #2993196