Idiom
White blood cell act

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

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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. At one's beck and call

To be under one's subjugation
To be in an advantageous position
To be always at one's service
Enjoying oneself without caring for others

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