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. He is in the habit of responding at the drop of a hat.

thoughtfully
wisely
without delay
foolishly

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Idiom
White blood cell act

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

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