It was not until the 1960s and 1970s archaeologistsmade real progress in understanding the script

A truck loaded with sand accelerates along a highway. The driving force on the truck remains constant. What happens to the acceleration of the truck as its trailer leaks sand at a constant rate throug The traditional Navaho does not allow copying of sand paintings because ______. The fact that reproductions of sand paintings are now commercially available shows that ______. What does a sand dollar look like according to Kara? The cast iron was melted and _____ into sand molds as soon as possible. For（）commodities as oil, sand and timber, rail is cheaper than road. As far as the European market is concerned, the writer thinks that Sand River products _______. When I passed the river, I saw some children ______ on the sand. As far as the European market is concerned, the writer thinks that Sand River products______ . The artist is so （） that he can make different changing pictures with sand. In summer Mary likes to walk along the beach with _________feet, leaving footprints on the sand.[ ] When ________ on sand, the plant grows close to the ground, ________ narrow leaves and small flowers. [ ] It’ll stop the sand from moving_____the rich farm land in the south.[ ] People have planted a lot of trees and grass in order to ____ wind and sand in the desert. People have planted a great many trees in order to __________ wind and sand in the desert. [ ] As they were walking along the beach, they came upon a plastic bag half buried in the sand.() Instead of sand ____everywhere, there is mud and water everywhere, _________it difficult travel from place to place. The Green Great wall can stop the wind and the sand ____to the rich land in the south of China. In the 1960s,__（） Experiments of this kind _______in both the U.Sand Europe well before the Second World War started