2. 考研
  3. A. in some cases B. perfected C. located A. 【T7】________the world’ s first microscopic blood-pressure sensor B. 【T8】________d

A. in some cases B. perfected C. located A. 【T7】________the world’ s first microscopic blood-pressure sensor B. 【T8】________d

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问题 A.  in some cases
B.  perfected
C.  located
A. 【T7】________the world’ s first microscopic blood-pressure sensor
B. 【T8】________deep within a high-rise apartment building
C. that allows scientists to envision and【T9】________actually build microscopic machines
    In the past, one of the biggest disadvantages of machines has been their inability to work on a micro scale. For example, doctors did not have devices allowing them to go inside the human body to detect health problems or to perform delicate surgery. Repair crews did not have a way of identifying broken pipes【T10】________However, that’ s about to change. Advances in computers and biophysics have started a micro miniature revolution【T11】________These devices promise to dramatically change the way we live and work.
    Micromachines already are making an impact. At Case Western Reserve University in Cleveland, Ohio, research scientists have designed a 4-inch silicon chip that holds 700 tiny primitive motors. At Lucas Nova Sensor in Fremont, California, scientists have【T12】________. Threaded through a person’ s blood vessels, the sensor can provide blood pressure readings at the valve of the heart itself.
【T10】
选项 A、 
B、 
C、 
答案B
解析 分析空白处所在句的结构可知，句子缺失的是次要成分，即定语或状语。题句的意思是：维修人员无法确定坏了的管道……。为什么无法确定呢?B选项就解释了原因，即located deep within a high-rise apartment building，这里located是过去分词短语作pipes的后置定语，说明broken pipes的位置。
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