对逾期（）以内的个人贷款，应进行短信、电话或催收函催收。
A、60天（含）
B、30天（含）
C、15天（含）
D、90天（含）
参考答案：A
A first-grade teacher use ten flash cards, numbered 1 through 10, to teach her students to order numbers correctly. She has students choose four flash cards randomly, then arrange the cards in ascending order. One day, she removes the cards numbered "2" and "4" from the deck of flash cards. On that day, how many different correct arrangements of four randomly selected cards are possible ？（）
A.70
B.210
C.336
D.840
E.1，680
温度判断法
