The medium and long-term treasury bond futures in the United States adopt the price quotation method. In its quotation, for example, 1 18'222 (or 1 18-222), the quotation consists of three parts, namely "①118' 222 ③ 2". The "①" part can be called the integer part of the treasury bond futures quotation, and the "②" and "③" parts are called the decimal part of the treasury bond futures quotation. Item d is the correct option. The value of the "②" part is "00 to 3 1" in 32-bit system. When the price rises to "32", add "1" to the forward integer part, and when the price falls below "00", borrow "1" to get "32". So, the answer to this question is D.