G71不可以加工（）。
A.外径
B.内径
C.外螺纹
D.圆锥面
参考答案：C
（天津市河东区201 4年高三二模考试） 6.-What do you think made Jack so cxcited?
-______first prize in the national English Speaking Competition.
A．As he won
B．Won
C．Winning
D．Because of winning
