19 What is this passage mainly about?
(A) How cooking was invented.
(B) Why people refused to make fire with imagination.
(C) How people learned to kindle and preserve fire.
(D) Why it was never easy for people to make fire for daily uses.
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統計: A(12), B(18), C(24), D(29), E(0) #1224304
統計: A(12), B(18), C(24), D(29), E(0) #1224304