A、At each trading post. B、At the brokerage firm. C、Via telephone. D、Outside the trading floor. A录音原文提到At this location，known as

The most prestigious exchange in the world is the New York Stock Exchange(NYSE). The NYSE is the first type of exchange, where much of the trading is done face-to-face on a trading floor. This is also referred to as a "listed" exchange. Orders come in through brokerage firms that are members of the exchange and flow down to floor brokers who go to a specific spot on the floor where the stock trades. At this location, known as the trading post, there is a specific person known as the "specialist" whose job is to match buyers and sellers. Prices are determined by using an auction method: the current price is the highest amount any buyer is willing to pay and the lowest price at which someone is willing to sell.
28. Which is the most notable exchange in the world?
29. In the NYSE, where does the "specialist" match buyers and sellers?
30. In the NYSE, what are prices determined by?