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【单选题】

_____
One should consider the expense of equipping a complete security system. For most complete systems which include driveway alarms, cameras, and electronic keypads, many can cost from $100 to $10,000. The homeowner can equip individual security products based on the needs of the home and family to save money.
  • A. 

  • B. 

  • C. 

  • D. 

  • E. 

  • F. 

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