Look at the picture and answer questions 45 ~ 46. Xiao Ming, who lives in Liwan District, feels that the weather is getting colder every day, and the night comes earlier every day. ...

When the earth revolves around the sun, the axis of the earth and the orbital plane form a fixed inclination of 66.5, which makes the direct point of the sun's rays move regularly between the tropic of cancer in a year.

When the sun shines directly on the equator, it is the vernal equinox or autumn equinox in the northern hemisphere; When the sun shines directly on the Tropic of Cancer, it is the summer solstice in the northern hemisphere; When the sun shines directly on the tropic of Capricorn, it is the winter solstice in the northern hemisphere.

Combined with the meaning of the question "the weather is getting colder every day, and the night is getting earlier every day", it shows that the days are getting shorter and the temperature is slowly decreasing; According to the chart, this area is now running between ② and ③.

Therefore, choose: B.