单项选择题
A. William Blake. B. William Wordsworth. C. Samuel Taylor Coleridge. D. Percy B. Shelley.
A. the existing airports are to be wasted. B. more people will be encouraged to travel. C. more oil will be consumed. D. more airplanes will be purchased.
A. Methods of cleaning teeth. B. Methods of caring for teeth. C. Development of toothpaste. D. Dental history.