单项选择题

Food that is rich In organic matter ______.

A．has been nourished by' fertilizers
B．contains vegetable matter that has not been consumed
C．has had chemicals and fertilizer added to it
D．contains large quantities of vitamins

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热门试题

单项选择题

The passage tells us that ______.

A．sugar is bad for the health
B．the use of sugar is habit forming
C．people need sugar to give them energy
D．sugar provides us with nothing useful

单项选择题

Which of the following is NOT mentioned in the passage

A．Chickens are fed on food which is little better than garbage.
B．Chickens live in very crowded condition.
C．The eggs chickens produce lack vitamins.
D．Chickens are free to move about.