如图为人体某结构的血管分布状况示意图，其中b为毛细血管，“→”表示血液流动方向，请据图回答：

在历史课堂上老师就第一次工业革命进行了提问，小明抽到的题目是：成为真正近代意义上的机器──珍妮机的发明者是谁？但他不能够回答，请你帮助他（    ）

Miss Fang: Hello, children. This is Mr. Xu. He's a fireman. Let's welcome Mr. Xu.

Mr. Xu: Thanks. Let's talk about ____safety today. Fire can burn down trees. It can ____people, too. We must be ____with fire. What mustn't we do in the forest or at home, children?

Peter: We mustn't ____in the forest.

Kitty: We mustn't play near fires or play with ____at home.

Mr. Xu: Very good. Safety first.