根据句意及汉语提示写单词,完成句子.

1. I've already           (付款) for that book.

2. The ____      (政府)has done a lot to protect the wild animals.

3.____        (天然的)food is good for our health.

4.1 will remember my first teacher____         (永远)．

5. We must take a____         (科学的)approach to the problem.

先将组织的信息传播给“意见领袖”，再由他们将信息传播给社会大众的传播方式称为（）

A、折射传播

B、两次传播

C、两步式传播

D、间接传播