一棵二叉树共有25个结点,其中5个是叶子结点,则度为1的结点数为
A.4
B.16
C.10
D.6
参考答案:A
. The order _____the general gave was _____we must break through the enemy’s defence .
A.that; /
B./; that
C.which; which
D.that ; which
地质年代单位分为()、()、()和()。