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In China's commodity futures market, in order to prevent the default risk of physical delivery, the transaction margin ratio is generally ().
Answer: b

Generally speaking, the closer to the delivery month, the greater the possibility that traders will face due delivery. In order to prevent the possible default risk of physical delivery, traders who are unwilling to make physical delivery will close their positions as soon as possible to ensure the transaction.

The proportion of gold will also increase as the delivery approaches. So the answer to this question is B.