32. What does the author mean by “caught on” in the second paragraph?
(A) The invention was understood.
(B) The invention became popular.
(C) The invention was found and stopped.
(D) The invention was held tightly in a hand.
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統計: A(47), B(484), C(78), D(67), E(0) #3436067
統計: A(47), B(484), C(78), D(67), E(0) #3436067