6. New ideas are slow to _____ and take much time to spread through conservative communities.
(A) pertain
(B) perforate
(C) perpetrate
(D) percolate
(E) perspire
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統計: A(4), B(4), C(10), D(7), E(2) #3671914
統計: A(4), B(4), C(10), D(7), E(2) #3671914