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American artist Stan Herd is known for many things—oil and watercolor paintings， wall paintings， and most of all， crop art. In fact， the great master is considered the first to use this way of artistic expression that has something to do with the skillful arrangement of plants， soil， and rocks， to create large masterpieces that are best viewed from a higher point， like a hill or an airplane.
Herd began to work on the field in early spring. His first challenge was to seek out plants and soils that would look like the colors of the original （原来的） painting. Besides long grasses and wildflowers， the artist also used many types of other materials to show the different colors in the original painting. He says that since Van Gogh often painted wheat fields he would have liked to use the grain to be the color of the sky. But given the time limits the artist decided to use oats （燕麦） instead， which are easier to grow.
With only 50 days to complete digging， producing leaves， and cutting the image into shape， Herd certainly had his work hard to finish. But as usual， he came through. The very difficult crop art will be on display until the end of fall. Born on a farm in Protection， Kansas， Herd began his career as an oil and watercolor artist. In 1981， he used his farming skills to create the first crop art or as Herd likes to call it “earthwork （大地艺术）”. It was a portrait of Kiowa war chief （基奥瓦印第安人首领） Satanta.
Since then， Herd has created 35 famous earthworks both in the US and other parts of the world including England， Australia， and South America.
Though most of Herd’s crop art disappears at the end of the growing season， he does have a few long-lasting pieces. The most famous is a grass and stone portrait of pioneer female pilot Amelia Earhart. She was formally chosen by the people of her hometown Atchison， Kansas. The one-acre image that was created in 1997 was voted as one of the 8 wonders of Kansas in 2010.
Questions：
1. What is Stan Herd most famous for？
2. Why did he use oats instead of grain？
3. What is his first crop art？
4. Why was the grass and stone portrait of pioneer female pilot successful？
Herd began to work on the field in early spring. His first challenge was to seek out plants and soils that would look like the colors of the original （原来的） painting. Besides long grasses and wildflowers， the artist also used many types of other materials to show the different colors in the original painting. He says that since Van Gogh often painted wheat fields he would have liked to use the grain to be the color of the sky. But given the time limits the artist decided to use oats （燕麦） instead， which are easier to grow.
With only 50 days to complete digging， producing leaves， and cutting the image into shape， Herd certainly had his work hard to finish. But as usual， he came through. The very difficult crop art will be on display until the end of fall. Born on a farm in Protection， Kansas， Herd began his career as an oil and watercolor artist. In 1981， he used his farming skills to create the first crop art or as Herd likes to call it “earthwork （大地艺术）”. It was a portrait of Kiowa war chief （基奥瓦印第安人首领） Satanta.
Since then， Herd has created 35 famous earthworks both in the US and other parts of the world including England， Australia， and South America.
Though most of Herd’s crop art disappears at the end of the growing season， he does have a few long-lasting pieces. The most famous is a grass and stone portrait of pioneer female pilot Amelia Earhart. She was formally chosen by the people of her hometown Atchison， Kansas. The one-acre image that was created in 1997 was voted as one of the 8 wonders of Kansas in 2010.
Questions：
1. What is Stan Herd most famous for？
2. Why did he use oats instead of grain？
3. What is his first crop art？
4. Why was the grass and stone portrait of pioneer female pilot successful？