泡囊
参考答案：
是一种类似小气泡的细胞器，被一层单位膜包被。目前认为泡囊是由内质网或高尔基体产生。
He asked us to him ______ carrying through their plan.
A．assist; with
B．help; to
C．assist; in
D．help; with
（）的主要特点：综合性、社会性、区域性、计划性和群众性。
