In comparison to the standard typewriter keyboard, the EFCO keyboard, which places the most-used keys nearest the typist's strongest fingers, allows faster typing and results in less fatigue. Therefore, replacement of standard keyboards with the EFCO keyboard will result in an immediate reduction of typing costs.
Which of the following, if true, would most weaken the conclusion drawn above?
(A) People who use both standard and EFCO keyboards report greater difficulty in the transition from the EFCO keyboard to the standard keyboard than in the transition from the standard keyboard to the EFCO keyboard.
(B) EFCO keyboards are no more expensive to manufacture than are standard keyboards and require less frequent repair than do standard keyboards.
(C) The number of businesses and government agencies that use EFCO keyboards is increasing each year.
(D) The more training and experience an employee has had with the standard keyboard, the more costly it is to train that employee to use the EFCO keyboard.
(E) Novice typists can learn to use the EFCO keyboard in about the same amount of time that it takes them to learn to use the standard keyboard.
题目分析：原文说用新的键盘会减少成本，问驳斥，我听到这个选项后应该感觉用了这个新的键盘不省钱，A说用了新键盘的人再用标准键盘会更困难，这个不会影响到键盘是否省钱，杀。B说新的键盘生产成本不贵且修理成本不高，那就省钱了啊，像个支持的，不像驳斥，杀。C说使用新键盘的agencies越来越多，这个和是否省钱没关系，杀。D说原来用标准键盘的多，这些人用新的键盘需要花更多钱来训练，那这个新的就不省钱了，符合问题要求，留着。E说花的时间多少，和省不省钱没关系，杀。
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