单项选择题
W：The plane arrives at 10:50．It is already 10:40now．Be quick! Q：Relax．Your watch must be fast．There are still twenty minutes left.
A.10：30. B.10：00. C.10：50. D.10：40.
A. he became a telegraph operator, a newsboy, and then got his first patent B. he became a newsboy, got his first patent, and then became a telegraph operator C. he got a patent, became a telegraph operator, and then became a newsboy D. he became a newsboy, a telegraph operator, and then got a patent
A. the increase of population B. the limited energy resources C. the more serious air pollution D. the development of technology