单选

It is no easy job to carry out a general plan for birth control throughout the world because ______.

  • A.there are too many underdeveloped countries in the world
  • B.underdeveloped countries have low level of industrial development
  • C.different governments have different views of the question
  • D.even the developed countries may have more complex problems
参考答案
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No matter where it is used, “Flextime” system has proved ______.

  • A.entirely effective
  • B.a complete failure
  • C.to be disliked by the employers
  • D.too difficult to carry out

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  • B.can avoid busy traffic
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  • A.work an agreed total number of hours per week
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“Key” time is a period when ______.

  • A.visitors come to the plants
  • B.all workers must be at work
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