在危险化学品中毒、污染事故预防控制措施中，＿是控制化学品危害的首选方案。
A.变更工艺
B.隔离
C.替代
D.通风
参考答案：C
Our teacher is clever and hardworking, but not very good at _______ his ideas to us.
A．getting over
B．getting across
C．getting on
D．getting into
核仁组织者
