A friend's reading - NCEII Lesson 5

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Lesson 5 No wrong numbers

First listen and then answer the question.

What does 'No wrong numbers' mean？

Mr.James Scott has a garage in Silbury and now he has just bought another garage in Pinhurst. Pinhurst is only five miles from Silbury， but Mr. Scott cannot get a telephone for his new garage， so he has just bought twelve pigeons. Yesterday， a pigeon carried the first message from Pinhurst to Silbury. The bird covered the distance in three minutes. Up to now， Mr.Scott has sent a great many requests for spare parts and other urgent messages from one garage to the other. In this way， he has begun his own private 'telephone' service.