单项选择题

Which of the following can reflect the ever-changing ethnic structure of America

A．Sportsman.
B．Audience.
C．Both of them.
D．None of them.
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单项选择题
What is the premise behind a project of the Massachusetts Institute of Technology
A．Electronic ink.
B．Electronic book.
C．Laptop.
D．LCD screen.
单项选择题
What is the main difference between an electronic book and a LCD screen
A．The power they need.
B．The portability they come to.
C．The convenience they make.
D．The content they store.
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