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A. the auctioneer knocks the buyer down
B. the auctioneer knocks the rostrum down
C. the goods are knocked down on to the table
D. the auctioneer bangs the table with a hammer

A. would make learned responses when it saw the milk
B. would carry out learned movements when it had enough to drink
C. would continue the simple movements without being given milk
D. would turn its head to right .or left when it had enough to drink