评标的核心是（），其对标书进行实质性审查。
A．初步评审
B．综合评审
C．详细评审
D．响应性评审
参考答案：C
We couldn't buy anything because _______ of the shops opened at that time. [ ]
A. all
B. some
C. any
D. none
智能系统是指具备一定智能行为的系统。
