Tourists take a sightseeing aircraft in the Flaming Mountains Scenic Area in Turpan, northwest China's Xinjiang Uygur Autonomous Region, April 6, 2014. Turpan, a tourism-oriented city known for its hot summers, saw an increase in the number of tourists as it gets warm in April. (Xinhua/Jiang Xiaoming)

A Uygur man who offers camel-riding service waits for customers in the Flaming Mountains Scenic Area in Turpan, northwest China's Xinjiang Uygur Autonomous Region, April 6, 2014. Turpan, a tourism-oriented city known for its hot summers, saw an increase in the number of tourists as it gets warm in April. (Xinhua/Jiang Xiaoming)

Tourists pose for photos next to a statue of Monkey King, a character of the 16th-century Chinese novel "Journey to the West", in the Flaming Mountains Scenic Area in Turpan, northwest China's Xinjiang Uygur Autonomous Region, April 6, 2014. Turpan, a tourism-oriented city known for its hot summers, saw an increase in the number of tourists as it gets warm in April. (Xinhua/Jiang Xiaoming)

A sightseeing aircraft hovers over the Flaming Mountains Scenic Area in Turpan, northwest China's Xinjiang Uygur Autonomous Region, April 6, 2014. Turpan, a tourism-oriented city known for its hot summers, saw an increase in the number of tourists as it gets warm in April. (Xinhua/Jiang Xiaoming)

Tourists take a sightseeing aircraft in the Flaming Mountains Scenic Area in Turpan, northwest China's Xinjiang Uygur Autonomous Region, April 6, 2014. Turpan, a tourism-oriented city known for its hot summers, saw an increase in the number of tourists as it gets warm in April. (Xinhua/Jiang Xiaoming)

Tourists visit the Flaming Mountains Scenic Area in Turpan, northwest China's Xinjiang Uygur Autonomous Region, April 6, 2014. Turpan, a tourism-oriented city known for its hot summers, saw an increase in the number of tourists as it gets warm in April. (Xinhua/Jiang Xiaoming)

Private cars are seen at a parking lot in the Flaming Mountains Scenic Area in Turpan, northwest China's Xinjiang Uygur Autonomous Region, April 6, 2014. Turpan, a tourism-oriented city known for its hot summers, saw an increase in the number of tourists as it gets warm in April. (Xinhua/Jiang Xiaoming)