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When a contractor is ready to begin construction of asuperhighway, he makes a preliminary study of the drawings andblueprints supplied by the engineers. He gains mental picture. of the whole jobbefore he begins actual construction.


  1. A.
    preparatory
  2. B.
    extensive
  3. C.
    scientific
  4. D.
    necessary
A
解析:
從整句話的意思來看,preliminary study是發(fā)生在actual construction之前,所以它的意思應是初級的,預備的,所以答案應為A
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