The geographical map of senior one is the incident map of sunlight from the south window of a certain place in China to noon that day.

The key to this problem is to judge when 1, 2 and 3 are sunshine respectively. The stem of this question tells us that it is China's house, that is to say, the house is in the northern hemisphere, 1, 2,3 are the rays of the sun from the bisector to the sun, and the three rays are on the same side of the house, which means that the house must be located in the area north of the Tropic of Cancer, thus excluding the A option of the first question. Since it is judged that the house is located in the north of the Tropic of Cancer, we can judge the solar terms according to the solar altitude angle at noon. In the area north of the Tropic of Cancer (for example, where we live), the higher the solar altitude angle, the smaller the indoor area. Therefore, 1 has the largest solar altitude angle and the smallest indoor area, which should be the summer solstice, the smallest solar altitude angle and the largest indoor area, which should be the winter solstice. 1 is the summer solstice, 2 is the vernal equinox, and 3 is the winter solstice. Only by knowing what the three lines represent can we answer the following questions.

The first question, a, has been ruled out. B option 1 is the summer solstice when it shoots into the window, and southerly winds should prevail in China. When the sun shines into the window as shown in Figure 3, it is the winter solstice. At this time, it is an extreme night phenomenon in the Arctic Circle, which is not suitable for investigation.

Second question, from winter to sunrise, option A should be the month with the lowest temperature in China, option B should be Nanning with short days and long nights, and option C should be the South Pole with extreme days from winter to sunrise.

The third question has already said that it is noon, so it is local time 12, while Beijing time is 14, which is two hours faster. According to the principle of east plus west subtraction, east longitude 120 degrees minus 30 degrees equals 90 degrees east longitude.