根据《国家中长期科学和技术发展规划纲要（2006-2020）》，“十一五”期间，科技进步对经济增长的贡献率要达到（）以上。

A.40%

B.45%

C.50%

D.55%

I'm afraid there are two uncorrected mistakes in your paper. The underlined part means ______. [     ]

A. mistakes which are not correct

B. mistakes which are incorrect

C. mistakes which have been corrected

D. mistakes which haven't been corrected