Millennium is one of the twenty-four solar terms, which falls around September 7th in the solar calendar every year. In the Millennium, the temperature difference between day and night is large in mos

Millennium is one of the twenty-four solar terms, which falls around September 7th in the solar calendar every year. In the Millennium, the temperature difference between day and night is large in most parts of China, and the temperature begins to drop. 3.D

First of all, it is obvious that in the northern hemisphere north of the Tropic of Cancer, the winter solstice has the shortest day and the longest night. The autumnal equinox is as long as day and night. Therefore, from the Millennium to the autumnal equinox, the days should be gradually shortened, but the days are still longer than the nights. So a is wrong. During this period, the Antarctic polar sun should be gradually expanding, so B is wrong, and the speed of revolution is accelerating, which does not slow down this process, so C is wrong.

4.A

White dew refers to the obvious dew in the morning, and the greater the temperature difference, the more obvious the phenomenon of white dew, so choose A.