从图可以分析，电视广告比报纸广告所占的市场份额( )
A．略小
B．大得多
C．略大
D．小得多
参考答案：C
一棵二叉树共有47个结点，其中有23个度为2的结点。假设根结点在第1层，则该二叉树的深度为______。
— What is our head teacher like, do you know?
— Oh, he is very kind _____ he looks very serious. [ ]
A. because
B. though
C. if
D. when
