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There are more than 200 different cold viruses. You can build up protection against a cold virus that you have already had. How ever, this 'immunity' can not help a person fight off a different cold virus.

Immunity means:
A. the spread of a disease
B. the body's ability to fight of disease
C. a way to keep sick people away
D. an anti cold medicine

I think it's B

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    Right.

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