A:2009
B:2010
C:4018
D:4020
下列关于地球形状的描述,正确的是( )
There is a common belief among the students in our school ______ they should try their best to learn and reach the peak of their academic performances.
已知f(n)=1+3+5+…+(2n﹣5),且n是大于2的正整数,则f(10)= ____.