The fastest solar term

A, China Teachers' Day is in September 10, and the earth's revolution speed is the slowest in early July, with a difference of two months. Among the four festivals, the earth's revolution speed is slow, which does not meet the meaning of the question;

B, International Labor Day is May 1, and the earth's revolution speed is the slowest in early July, with a difference of two months. Among the four festivals, the earth's revolution speed is slow, which does not meet the meaning of the question;

C World Environment Day time is on June 5th, and in early July, the earth's revolution speed is the slowest, with a difference of 1 month. Among the four festivals, the earth's revolution speed is the slowest, which does not meet the meaning of the question.

D New Year's Day is 65438+1 October 1, and early June1.The earth's revolution speed is the fastest, and the two are basically close, so the earth's revolution speed is the fastest among the four festivals, so it is correct.

Therefore, choose: d.