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 flog a dead horse

To revise interest in an old subject
To act in a foolish way
To revive old memories
To waste one's efforts

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Idiom
Agro forestry is

Growing of tree with cultivation of crop in the same field
None of these
Growing tree for forest
Growing tree after cutting crop

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