跆拳道起源于()
A、朝鲜半岛
B、日本
C、美国
参考答案:A
When father was young, he ______ from morning till night. [ ]
A. was made work
B. was made working
C. made to work
D. was made to work
转轮利用水流的压力能和动能做功的水轮机称为反击时水轮机。