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. By the rule of thumb

By the use of trickery
By the use of force
By cheating and deception
By practical experience which is rather rough

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Idiom
White blood cell act

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

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