单项选择题
A．现在一年过去了，但是北京在另一个领域或产品上并没有失去它传统的优势。 B．北京几乎每年都要失去它在一个领域或一种产品上的传统优势。 C．一年刚过去，北京在另一个领域或产品上失去了它的传统优势。 D．北京没有一年不失去它在某个领域或一种产品上的传统优势。
A. Edison was curious in nature B. Edison’s mother played an important role in his life C. Edison is a great inventor because he is deaf D. Edison could create new things in two weeks
A. complain about people’ s slow actions to protect the environment B. advise people to take actions to protect the environment C. show himself to be an active environment protector D. point out the bad effects of technologies in protecting environment