单项选择题

The specialization of food was started by ______.

A．the emergence of supermarkets
B．the rise of agriculture
C．the rich countries
D．the modern shops
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单项选择题
The conclusion seems to be that we ______.
A．could make use of more natural species
B．don't cultivate the right kind of food
C．produce more food than we need
D．cultivate too many different species
单项选择题
In prehistoric times people ______.
A．ate much more than we do today
B．lived mainly on plant food
C．had a wide-ranging diet
D．were more fussy about what they ate
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