A:1/4 2倍
B:1/2 4倍
C:1/2 2倍
D:2倍 2倍
—Excuse me, is this _______ bicycle?
—No, it isn’t. _______ is over there under the tree.
____
如图为小肠绒毛内的血管示意图,其中表示动脉的是( )