What me most is its sights.
A:interested; interested
B:interested; interesting
C:interesting; interesting
D:interesting; interested
物质
铜
银
金
密度g/cm3
8.9
10.5
19.3
如图1所示,圆上均匀分布着11个点A1,A2,A3,…,A11.从A1起每隔k个点顺次连接,当再次与点A1连接时,我们把所形成的图形称为“k+1阶正十一角星”,其中1≤k≤8(k为正整数).例如,图2是“2阶正十一角星”,那么∠A1+∠A2+…+∠A11=____;当∠A1+∠A2+…+∠A11=900°时,k=____.