ONS在DNS基础上进行EPC解析，因此其输入端是__________，而DNS用于解析，其输入端是_________。
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EPCIS在整个EPC网络中的主要作用，就是提供一个接口，以存储和管理EPC捕获的信息。
A. 对
B. 错
The author stopped playing chess when he ____________.
A. was seven
B. was eleven
C. got a cell phone
D. got a computer
Which of the following games were still on the author’s phone?
A. Chess.
B. Tetris.
C. Snapchat.
D. All of the above.
In Tetris, you have ____________ opponent(s).
A. one
B. two
C. three
D. no
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