美国财政部拍卖四个月期国债，得标利率4.240%（5月7日报4.2%），投标倍数3.28（前次为3.02）。

Group 1 - The U.S. Treasury auctioned a four-month Treasury bill with a winning yield of 4.240%, an increase from the previous rate of 4.2% reported on May 7 [1] - The bid-to-cover ratio was 3.28, which is higher than the previous ratio of 3.02, indicating stronger demand for the securities [1]