When is the flushing scheduled to be completed?

admin2010-11-20  21

问题 When is the flushing scheduled to be completed?
  
The Lester Water Department is flushing the municipal water system this week, starting Monday, between the hours of midnight and five A.M., and lasting through Friday morning. Flushing is performed every spring as regular maintenance to remove mineral deposits and sedimentation that has collected over the winter months. Residents are asked to let the cold water run from the tap for a full minute to ensure that it is clear. The water may be temporarily discolored but it is safe to drink and to use for cooking. For more information, call three-five-seven, five-four, three-nine.

选项 A、It is performed every six months.
B、It is done to remove dirt from the water system.
C、It was ordered to be done by the State Water Commission.
D、It requires shutting down the municipal water system temporarily.

答案B

解析 第二句话中提到需要清理的主要目标为mineral deposits和sedimentation,含有remove dirt选项(B)为正确答案
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