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  3. Design of all the new tools and implements is based on careful experiments with electronic instruments. First, a human "guinea p

Design of all the new tools and implements is based on careful experiments with electronic instruments. First, a human "guinea p

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问题     Design of all the new tools and implements is based on careful experiments with electronic instruments. First, a human "guinea pig" is tested using a regular tool. Measurements are taken of the amount of work done, and the buildup of heat in the body. Twisted joints and stretched muscles cannot perform as well, it has been found, as joints and muscles in their normal positions. The same person is then tested again, using a tool design according to the suggestions made by Dr. Tichauer. All these tests have shown the great improvement of the new designs over the old.
    One of the electronic instruments used by Dr. Tichauer, the myograph, makes visible through electrical signals the work done by human muscle.
    Another machine measures any dangerous features of tools, thus proving information upon which to base a new design. One conclusion of tests made with this machine is that a tripod stepladder is more stable and safer to use than one with four legs.
    This work has attracted the attention of efficiency experts and time-and-motion-study engineer, but its value goes far beyond that. Dr. Tichauer’s first thought is for the health of the tool user. With the repeated use of the same tool all day long on production lines and in other jobs, even light manual work can put a heavy stress on one small area of the body. In time, such stress can cause a disabling disease. Furthermore, muscle fatigue is a serious safety hazard.
    Efficiency is the by-product of comfort, Dr. Tichauer believes, and his new designs for traditional tools have proved his point.
It can be inferred from the passage that________.
选项 A、a stepladder used to have four legs
B、it is dangerous to use tools
C、a tripod is safer in a tool design
D、workers are safer on production lines
答案A
解析 推理判断题。第三段第一句提到另一台机器可以测量工具的任何危险特征，从而为新设计提供依据；紧接着第二句进一步指出，用这台机器所做的试验结论之一是，三脚梯使用起来比四脚梯更稳固、更安全。由此可知，三角梯是所测试的新设计，而四脚梯就是旧设计，故A项为答案。原文只提到测量工具的危险特征，并未表明使用工具很危险，故排除B项；该段第二句提到三脚梯是使用起来更安全，而不是在工具设计中更安全，故排除C项；原文并未提及工人在生产线上是否更安全，故排除D项。
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