某科学家发现克隆人的诀窍，这一发现可申请专利。 [ ]
参考答案：错
I met Tom yesterday. I_____ him since we left school. [ ]
A. have not seen
B. saw
C. didn't see
D. hadn't seen
贯彻“三个代表”重要思想，关键在于( )。
A．坚持立党为公、执政为民
B．坚持与时俱进
C．坚持发展生产力
D．坚持党的领导
