In a certain year, Monday occurs more frequently than Friday, and Sunday occurs more frequently than Wednesday. Please, what day of the week was March 1st in that year?
Cycle problem.
$$
365 \div 7=52 \cdots \cdots 1, \quad 366 \div 7=52 \cdots \cdots 2 \text {; }
$$

According to the problem, the number of Sundays and Mondays in this year is $52+1=53$ days each, and the number of Tuesdays, Wednesdays, Thursdays, Fridays, and Saturdays is 52 days each; this year is a leap year;
January 1st of this year is a Sunday;
In a leap year, from January 1st to March 1st, there are $31+29+1=61$ days;
$$
61 \div 7=8 \cdots \cdots .5 \text {; }
$$

March 1st of this year is a Thursday.