单项选择题
A．Sequoyah developed a form of writing with the help of the Cherokee tribe. B．Sequoyah was a very observant young man. C．Sequoyah spent, twelve years developing his alphabet. D．Sequoyah was honored by having some trees named after him.
A．our natural surroundings are in danger of being destroyed by industry B．the fixed supply of natural resources marks a point beyond which economic growth cannot continue C．the world population is ever increasing D．more efforts should be made to improve the quality of our material life
A. arguments in support of something B. disagreements C. people who argue for something D. people who argue against something