牛掌骨共有三块、第三、四掌骨发达，愈合成（），第五掌骨又称（）。
参考答案：大掌骨；小掌骨
_____________ late, but also he forgot his books.
A．Not only did he turn up
B．Not only he turned up
C．Not only did he turn out
D．Not only he turned out
安检人员在执勤时，应当态度和蔼，检查动作（），不得推拉旅客。
A、轻柔
B、粗重
C、规范
D、美观
