What do we know about the speaker’s life in the past（）
A. It was stressful.
B. It was colorful.
C. It was peaceful.
D. It was boring.
What did the speaker use to do for a living（）
A. He ran a village shop.
B. He worked on a farm.
C. He worked in an advertising agency.
D. He was a gardener.
根据学校无线网络的需求和拓扑图可以判断，连接学校操场无线AP的是 (1) 交换机，它可以通过交换机的 (2) 口为AP提供直流电。 连接学校操场无线AP的是（）交换机
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