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

<上一题目录下一题>

热门试题

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

单项选择题

Most of us have come to expect ______.

A．no variation in our diet
B．a reduction in food supplies
C．a specialist diet
D．food conforming tea set standard