The moon phases of traditional festivals in China, Spring Festival and Mid-Autumn Festival, are () A. Full moon, first quarter moon B. Full moon, new moon C. New moon, first quarter moon D.

Because the Spring Festival is the first day of the first lunar month, the moon runs between the earth and the sun on this day, and the illuminated hemisphere of the moon faces away from the earth, so the moon can't be seen, which is called the "new moon"; The Mid-Autumn Festival is on August 15th. On this day, all the bright sides of the moon face the earth, so we see a full moon, which is called "full moon".

Therefore, choose: d.