The teacher kept students _______ books for half an hour.
A:read
B:reading
C:reads
D:to read
在△ABC中,AC=BC,∠ACB=90°,将△ABC绕点A旋转60°到△ADE的位置,点C的对应点为E,连接CD,若AC=BC=1,则CD的长为____.
— Yes, they are my plants.