单项选择题

What percentage of the world population is illiterate

A．More than 1/3.
B．More than 1/5.
C．More than 1/4.
D．A little Jess than 1/4.
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单项选择题
According to the conversation, what is one problem with ann exericse
A．They don’t get rid of flabby arms.
B．They can damage arm muscles.
C．They aren’t acceptable to most people.
D．They can raise one’s blood pressure.
单项选择题
What is the main topic of the conversation
A．Food packaging.
B．Varieties of fish.
C．A new snack food.
D．An artificial food flavoring.
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