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Class 10 - English - Unit-1 Do Indians get enough sleep?

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Unit-1 Do Indians get enough sleep?

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Question A.8(2):

Natural killer cells

(a) make a person look old pretty quickly.

(b) are produced in large numbers when we stay awake.

(c) help us fight viruses and bacteria.

(d) work well even for sleep-deprived people.

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