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。
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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
According to the author, Tetris and life are similar because_________.
A. they are for the present and you cannot control the future
B. they are for the future and you can predict what will happen in the future
C. they are complicated in nature and we should do nothing
D. Tetris can be treated as the real life we have
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