政府是宏观经济的管理者和社会经济生活的调节者。 ( )
参考答案：对
Tom concluded his lecture ________ that he couldn’t emphasize enough how important our efforts were.
A．to say
B．saying
C．said
D．having said
双螺旋DNA分子由两条序列相同的DNA链组成。 ( )
