中央政治局、中央政治局常务委员会听取中央巡视情况汇报，在一届任期内实现中央巡视全覆盖。
参考答案：对
---All the teachers went on a trip to Hainan yesterday Mr. White. Why?
---Because he was too busy a new novel to travel.
A．except; writing
B．besides; writing
C．except for; to write
D．beside; to write
树中度为零的结点称为______。
