The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.
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听力原文：Man: Some of us can remember the days when a visit to the supermarket was no fun. If you needed information, there was never an assistant in sight. And when you did find one, they knew less than you. Well, that time is long past, and the seminar I watched recently at our award- winning supermarket was a revelation. It endeavoured to keep sa[es assistants up-to-date with information about food technology, how to access product information on the store intranet, and so on. And that's what gave this supermarket its edge.
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