What is the implied meaning of “If it is a good shop, no assistant will approach you with the inevitable greeting:‘Can I help you, sir?’”?
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What does the sentence “…when he has led you there, the assistant should retire discreetly and look as if he is not interested in selling a single book”suggest to you?
How do you understand the sentence “Then, and only then, are his services necessary”?
What does the word thisrefer to in the sentence “There is a story which well illustrates this”?
Why was the medical student surprised?