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The landform leads to changes in the air and the overall environment, and the proportion of moisture, vegetation, and air changes. In fact, the key is because of the geographical location.

Take a globe and a light bulb and compare yourself to the picture.

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1. a。When m coincides with s, it means that the global day and night are equinoxes, and the time is judged to be the spring or autumn equinox.

At this time, the direct point of the sun is located at the equator, and the height of the sun at noon decreases from the equator to the north and south, so a is correct. b describes the months of June and July; c refers to the winter in our country, around the winter solstice; d is from July to September, and the summer is the main flood season of the Tarim River. So choose A.

2. d。It can be seen from the maximum MS distance when MN coincides, and the arc B is the Antarctic Circle, so at this time, the Antarctic Circle is either polar day or polar night, (this point cannot be further judged due to the constraint of the question stem condition, and no judgment is required) Therefore, the length of the day in n is 0 or 24 hours, and D is correct.

A and B both describe the day of the summer solstice and omit the day of the winter solstice; Since the sun is still on the morning and dusk line at noon on the day n, and the solar height at all points on the morning and dusk line is 0, the c term is wrong. Pick D.

In fact, if you can't understand the diagram for this question, you can complete the diagram first. As you can see, this is a projection of the South Pole as the center.

1.When the M point coincides with the S point, it can be judged that the morning and dusk line just passes the South Pole, which can be judged as the spring equinox or autumn equinox. then only option A is eligible.

The meridian of the point is 30° east longitude, and when m coincides with n and the distance from point s is the largest, it can be judged that there are two cases when m and point s are the largest, one is June 22 (the summer solstice in the Northern Hemisphere) and the other is December 22 (the winter solstice in the Northern Hemisphere). It can be judged that the day length of n is 0 (June 22), the day length is 24 (December 22), and the noon sun height must be considered only on June 22, and the B item is wrong.

When the point coincides with the point S, it is exactly the spring and autumn equinox, the global day and night equinox, and the sun is directly on the equator, so a is correct.

b. The rainy season in the Yangtze River basin is June and July.

c At that time, there was no polar day in Antarctica, which was not suitable for investigation.

The Tarim River enters the flood season in the summer.

2。The arc A is the morning and dusk line, if M and N coincide, and the distance between M and S is the largest, then the direct sunlight must be on the meridian where Mn is located, that is, 30 °E, if it is 150 °W, then it is the Antarctic Pole Day, the sun should be directly on the Tropic of Capricorn, Mn can not coincide, so A is wrong.

b At this time, 30°E is 12 o'clock at noon, and the difference between Beijing time is 120-30=90°, that is, 6 hours, and Beijing is east of 30°E, so Beijing time is 12+6=18 o'clock b is wrong.

c, at this point it is clear that the solar altitude is greater than 0 degrees correctly.

d, n at this time there is no polar day or polar night.

Question 1 chooses a because m s coincides with equinoxes and the sun hits the equator directly, so the height of the sun decreases from the equator to north and south. It should be a direct shot at 30 b east longitude, it should be 18 o'clock on June 21, d should be 0 hours, and it cannot be 24 hours.

Problem 1: In the figure, the linear velocity of the Earth's rotation on the MN line is equal, and the MN line passes through the mountain, and the higher the altitude, the greater the rotational velocity, which is judged to be located in the Northern Hemisphere. The dotted line is a front, and according to the western side of the northern hemisphere, there is a cold front; At 16 o'clock on the 7th, the cold wind passed through the first place, so the weather condition may be strong winds to cool down and rain. This question does not give the width of the cloud system of the peak line, so there is no way to use a ruler to measure whether the estimate is completely transited, you only use a ruler to measure the distance from the peak line (cold front center) to the first place, and the peak line passing through A does not mean that the impact is completely over. According to the distance from the peak line to A after 26 hours, the peak line (center) should be passing through A or just passing through A.

Therefore, it can only be judged that there may also be strong winds to cool down.

Question 2, the precipitation in the D area is more, and the annual temperature difference is small, it should be located in the southeast coastal area, the southeast coastal area is generally short river flow, mostly small rivers, the flood process and inundation time is generally not long, so the flood disaster will not appear on a large scale, and the typhoon is a common and frequent weather or disaster in summer and autumn in the southeast coast. Therefore, it is reasonable to think that it is a typhoon.

Question 3: Judge the wind force according to the density of the isobar. The strength of the wind depends on the density of the isobar, the denser the isobar, the greater the wind, and vice versa. The isobars are sparse and the air pressure difference between the isobars is small, which indicates that this is a weak cold front cloud system.

Therefore, there will be no strong winds.

According to the background of June given in the title, it belongs to the early summer season. And looking at the map, it can be seen that the place is located at 30° north latitude and 110 ° east longitude, in the middle and lower reaches of the Yangtze River. At the beginning of summer every year, warm and humid air currents from the ocean and cold air from the south of the continent collide and confront, forming a famous weather system in the middle and lower reaches of the Yangtze River and the Huaihe River basin - the Jianghuai quasi-stationary front.

Therefore, the answer should be rainy weather, which describes the pressure and weather system during the rainy season in June in the middle and lower reaches of the Yangtze River.

An hour later, the front had just moved past Ground A, which was affected by a cold front.

2. Not only consider D, but also ABC all three places are suitable.

3. Most areas of the Yangtze River basin were affected by the quasi-stationary front of the Yangtze River and Huaihe in June, forming rainy and continuous weather (plum rain).