Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. To keeps one's temper

To be aloof from
To become hungry
To be in good mood
To preserve ones energy
None of these

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Idiom
White blood cell act

As a medium for oxygen transport from lung to tissues
As a source of energy
As a defence against infection
For clotting blood

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