"We have good places in Xinjiang, good pastures in the north and south of Tianshan Mountain, fertile fields in Gobi Desert, snow-melting irrigation farms, golden rice and fragrant flowers in wheat ears, and grass in the wind to see cattle and sheep. Xinjiang is located inland and has a temperate continental climate. During the day, the sunshine is strong, the heat is sufficient, the photosynthesis efficiency of plants is high, and the temperature difference between day and night is large. The nutrients formed by plants through photosynthesis can be effectively accumulated, so the melons and fruits in Xinjiang are particularly sweet. Therefore, option a meets the problem.

So choose: a.