45. What is the passage mainly about?
(A) Different functions of human teeth.
(B) People with dental problems.
(C) The advent of cooked foods.
(D) Evolution in terms of human teeth.
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統計: A(10), B(11), C(3), D(55), E(0) #573571
統計: A(10), B(11), C(3), D(55), E(0) #573571