The weather system with similar principle to the snowfall process caused by the Great Lakes effect is () A. Warm front B. Cold front C. Cyclone D. Anti-gas.

A, the temperature of cold air passing through the lake rises. When it moves to the lake shore, the temperature of the air from the lake is higher than that of the land on the lake shore. The air from the lake is equivalent to a warm air mass, and the land air on the shore of the lake is equivalent to a cold air mass. The warm air mass actively moves to the cold air mass, which is a warm front, so it conforms to the meaning of the question;

B after crossing the lake, the original cold air temperature rises and the water vapor increases. When this cold air continues to move to the other side of the lake, it will form more snowfall, which should be similar to a warm front, not a cold front, so it does not meet the question;

C, if the precipitation formed by cyclone should gradually decrease from a central point to the surrounding areas, but there is no such feature in Figure A, it does not meet the meaning of the question;

D, the anticyclone center formed by high pressure prevails with descending flow, and the wind is small and the weather is clear, which does not meet the meaning of the question.

So choose: a.