泛在物联网体系架构包括（）。
A、物联网应用层
B、物联网网络层
C、物联网感知层
D、物联网通信层
参考答案：A, B, C
— Can I ask you a few straightforward questions about yourself?
— No problem. I like ______ when people are open and direct. [ ]
A. that
B. this
C. it
D. them
