单项选择题

Every large city has its shifting population of vagrants.But in most (), these are poor men.

A. conditions
B. cases
C. situations
D. circumstances

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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. Chocolate drinks.
C. Potato.
D. Coffee.
单项选择题
Some in the sentence Some still exist today. refers to().

A. cocoa trees
B. chocolate
C. shops
D. meeting places
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