阿摩線上測驗
17. The movement of air into and out of the lungs is carried out by creating a
pressure________ between the lungs and the atmosphere.
(A) level,
(B) amount,
(C) gradient,
(D) input,
(E) quantity
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統計： A(0), B(0), C(3), D(0), E(0) #2843006
統計： A(0), B(0), C(3), D(0), E(0) #2843006