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. It was a Herculean task for me.

easy work
impossible task
an entirely new task
work requiring great effort

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Idiom
Which statement regarding the mammalian heart is correct?

When the right atrium contracts, it forces blood into the left atrium
Blood is pumped from the heart via the atria
Oxygen-loaded blood moves only through the right side of the heart
In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs

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