Answer the following true/false questionA tariff on imported tractors helps U.S. consumers of tractors and hurts U.S. producers of tractors.（  ）

Answer the following true/false questionA tariff on imported tractors helps U.S. consumers of tractors and hurts U.S. producers of tractors. A: 正确 B: 错误

France produces wine and tractors. If, given the same resources, France can increase production of wine and tractors, at the same time, then France A: is producing outside his Production Possibility Frontier B: is has achieved technological advancement in the production of kola and cashew nuts C: is producing on its Production Possibility Frontier D: is producing inside its Production Possibility Frontier

After the new technique was introduced, the factory produced _____tractors in 2002 as the year before.

They ______ only five tractors two years ago． A: gained B: obtained C: accepted D: possessed

Tractors and other agricultural machines greatly facilitate farming. ( ) A: communicate B: subsidize C: grade D: ease

According to the textbook, the latest technology that farmers have adopted is ______. A: artificial fertilizers B: pesticide C: tractors D: computers

After the new technique was introduced, the factory produced _____ tractors in 2002 as the year before. A: as twice many B: as many twice C: twice as many D: twice many as

After the new technique was introduced, the factory produced ________ tractors in 1998 than the year before. A: as twice many B: as many twice C: twice as many D: twice many as

Watch the video clip "Urbanization and the future of cities"and answer the following questions.Which of these technologies developed because of the desire to trade with other cities? A: Tractors B: City walls C: Roads D: Aqueducts