单项选择题

Travel was important in the past because it ______.

A．was a way of spreading ideas
B．broke down political barriers
C．led to economic progress
D．made new ideas less schooling
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单项选择题
It is clear that Steve Wozniak, Bill Gates and Linus Torvalds are ______.
A．all good examples of today's computer users
B．driving by greed, power, revenge, or some other malicious intent
C．to push programs beyond what they are designed to do
D．all dead
单项选择题
Why does the author say reducing the amount of meat in one's diet is environmentally beneficial
A．People who eat meat usually have weaker immune systems compared to those of vegetarians.
B．A lot of food and water are consumed in order to raise livestock.
C．90% of animals are raised in confinement.
D．Raising animals causes most of the destruction of nature.
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