据国外学者研究，蚊子、丸花蜂和蜻蜓这三种昆虫中，扇动翅膀频率最多的是哪种昆虫？

A. age is actually an advantage for technological entrepreneurship
B. experience is one of the prerequisites for innovative ideas
C. the age of scientists winning Nobel Prize is older than it was a century ago
D. age can be an impetus rather than resistance to creative ideas

A. describe the working condition of Apple"s manufacturing plant in China
B. disclose the secret behind Apple"s successful story
C. sing praises for Chinese workers" team-work spirit and high productivity
D. explain why the cheap labor in developing countries is a threat for American labor market