小内毒素可以引起
A．诱生多种细胞因子的产生
B．激活B细胞产生抗体
C．休克
D．激活巨噬细胞
E．低血压
参考答案：A, B, D
—Are they working near the house?
—_____. [ ]
A. Yes, there are
B. No, there isn't
C. No, there aren't
D. Yes, they are
断臂维纳斯是（）艺术中的（）艺术。
