49 According to the article, which of the following statements is true?
(A) The rate of industry growth has nothing to do with the telephone technology.
(B) Irrational personal conflicts have been solved because of the invention of telephone.
(C) The elevator has brought about a quantum leap in speed.
(D) Telephone technology cannot prevent wars.

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統計： A(7), B(49), C(43), D(67), E(0) #546581