Question

如果某年二月的 $13$ 号是星期五，那么二月 $1$ 号是星期几？

If February is a month that contains Friday the $13$ th, what day of the week is February $1?$

星期日

Sunday

星期一

Monday

星期三

Wednesday

星期四

Thursday

星期六

Saturday

相隔一周的日期在同一个星期几

Dates one week apart fall on the same weekday.

先把二月 $13$ 号与二月 $6$ 号比较，再倒数到二月 $1$ 号

Compare February $13$ to February $6,$ then count back to February $1.$

因为 $13$ 号是星期五，所以 $6$ 号也是星期五。 $1$ 号比这个星期五早 $5$ 天，因此是星期日。

所以正确答案是 A。

Since the $13$ th is a Friday, we know that the $6$ th is also a Friday. The $1$ st is $5$ days before the Friday, making it a Sunday.

Thus, the answer is A .