2. 外语
  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 【C1】______  tool. Measurements are taken 【C2】______ the amount of work done, and the buildup of heat in the body. 【C3】______ joints and stretched muscles cannot 【C4】______ as well, it has been found, 【C5】______ joints and muscles in their 【C6】______  positions. The same person is then tested again, using a tool designed according to the suggestions made by Dr. Tichauer. All these tests have shown the great 【C7】______ of the new designs over the old.
     One of the electronic instruments used by Dr. Tichauer, the myograph, 【C8】______ visible through electrical signals the work done by human muscle. Another machine 【C9】______ any dangerous features of tools, thus proving information upon 【C10】______ to base a new design. One 【C11】______ of tests made with this machine is that a tripod stepladder is more 【C12】______ and safer to use than one with four legs.
     This work has 【C13】______ the attention of efficiency experts and time-and-motion-study engineer, but its value goes far 【C14】______ that. Dr. Tichauer’s first 【C15】______ is for the health of the tool user. With the 【C16】______ use of the same tool all day long on 【C17】______ lines and in other jobs, even light 【C18】______ work can put a heavy stress on one small area of the body. In time, such stress can cause a disabling disease. 【C19】______ , muscle fatigue is a serious safety 【C20】______ .  
【C16】
选项 A、repeated
B、repeating
C、repeat
D、repetition
答案A
解析 语法结构题。此题考查的是非谓语动词的用法。现在分词表示主动的或者正在进行的动作，过去分词表示被动的或者已经完成的动作。“重复的使用”这个意思用英语表达应该是 repeated use，因为“使用”是“被重复”的，故选A。
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