Geography of senior one, textbook of Shandong Education Publishing House.

1, the latitude where the sun can shine directly twice a year is between the Tropic of Cancer and the Tropic of Cancer, and the Tropic of Cancer can only shine directly once a year. So the answer is a.

2. As shown in the figure

3. The order is: summer solstice June 22nd, autumnal equinox September 23rd, winter solstice 65438+February 22nd, vernal equinox March 2nd1.

4. As shown in the figure

5. The fastest time of the sun's revolution is perihelion 65438+1early October, so it is closest to the winter solstice C.