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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单项选择题

Toys have several functions except ______.

A．helping children to play
B．urging children to play
C．recommending ways for children to play
D．asking children to play

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