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. A large number of small scale industries have been set up in the rural areas.

demolished
encouraged
upgraded
opened

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Idiom
White blood cell act

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

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