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

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Idiom
White blood cell act

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

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