3、Grandma told Xiaoming: “There were 53 Sundays in 2006”. Smart Xiaoming immediately told Grandma: The New Year's Day of 2007 must be ( ).
(A) Monday
(B) Tuesday
(C) Saturday
(D) Sunday
3. Choose A
Solution: The year 2006 has 365 days, and $365=7 \times 52+1$. It is also known that 2006 has 53 Sundays, which means New Year's Day must be a Sunday, and December 31st is also a Sunday. Therefore, New Year's Day of 2007 is a Monday.