分泌免疫球蛋白的细胞是（）
A．浆细胞
B．成纤维细胞
C．巨噬细胞
D．纤维细胞
E．肥大细胞
参考答案：A
In their efforts to persuade us to buy that product,shopkeepers have made a close study of human
nature and have ________ all our little weaknesses. [ ]
A. divided
B. arranged
C. classified
D. separated
项目风险分析包括( )。
A．风险识别
B．风险趋势
C．风险估计
D．风险对策
E．风险评价
