单项选择题

How many common forms of sugar are exemplified in this passage.

A．One.
B．Two.
C．One hundred.
D．Several hundreds.
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单项选择题
hat is the percentage of the sugar used as food
A．19%.
B．90%.
C．10%.
D．30%.
单项选择题
When was sugar used widely
A．3,000 years ago.
B．In modem times.
C．Quite recently.
D．300 years ago.
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