A:Keeping
B:To kee
C:Kee
D:If you kee
如图,已知正三棱柱ABC﹣A1B1C1的底面边长为2cm,高为5cm,一质点自A点出发,沿着三棱柱的侧面绕行两周到达A1点的最短路线的长为____ cm.
我国最大的天然林区是( )
Mr Jackson hasn't decided this weekend.