1. The facts of our body in the first paragraph explain _______ .
(A)how people should use their muscles
(B)how amazing our body is
(C)why we should know more about our heartbeats
(D)why we need to see how long our intestine is
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統計: A(85), B(1065), C(103), D(58), E(0) #582783
統計: A(85), B(1065), C(103), D(58), E(0) #582783