一男性接受器官移植的最适宜供者是（）
A．其父
B．其母
C．其妻
D．同血型兄弟
E．孪生兄弟
参考答案：E
启动钻床时发现钻头晃动不可能的原因为（）。
A.钻头弯曲
B.钻头柄有毛头
C.主轴轴承磨损
D.皮带松
The board of the company has decided to ______ its operation to include all aspects of the clothing business.
A. extend B. enlarge C. expand D. amplify
