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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单项选择题
According to the passage, which book is the only book you'll ever need
A．The Bible.
B．A single volume.
C．New Age tome.
D．An electronic book.
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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