Geographic single choice solution

Today's day length is 18: 56-05: 29 = 13 hours and 27 minutes, and tomorrow's day length is 18: 57-05: 28 = 13 hours and 29 minutes, an increase of 13 hours. The length of the vernal equinox is 12 hours. Today, the length of the day has increased by 13 hours and 27 minutes-12 hours = 1 hour and 27 minutes = 87 minutes, so there are about 87/2 = 43.5 days from the vernal equinox to today, so it is estimated that this day is probably May 2.

Answer: C. Long summer (May 5)

19, choose d.

The direct point of the sun is in the northern hemisphere, and the direct point of the sun continues to move northward. The latitude of Beijing is higher than that of Singapore, and the difference of day length is getting bigger and bigger. At noon in Beijing, the height of the sun increases, while that in Singapore decreases, so the daily average temperature difference between Beijing and Singapore decreases.

Answer: D.①④