单项选择题

According to the passage, which of the following has changed the most in the last 500 years

A．Food.
B．Clothing.
C．Ideology.
D．Language.
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单项选择题
Scientists are not sure how serious the effects of global warming will be.
A． Right
B． Wrong
C． Not mentioned
单项选择题
The people of the coral island nations are unable to do anything substantial about the problem of global warming.
A． Right
B． Wrong
C． Not mentioned
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