单项选择题

According to the author the disadvantage of using paper to keep and send information is that ______.

A．it is hard to get enough paper
B．it wastes our time
C．it damages the environment
D．there is too much paper around
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单项选择题
The author seems to say that the invention of the computer is ______.
A．not so important as that of the steam and petrol engines
B．at least as important as that of the steam and petrol engines
C．less important than that of the steam and petrol engines
D．far more important than that of the steam and petrol engines
单项选择题
The thief stole my wallet ______ I knew it.
A．before
B．until
C．while
D．after
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