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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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.
单项选择题
It will be a few years before we can see electronic book for sale because ______.
A．we haven't mastered the manufacturing technology yet
B．the electronic ink which must be conductive couldn't be produced in large scale
C．the electronic book will be too expensive to buy
D．you can't take an electronic book with you anywhere
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