Idiom
Which statement regarding the mammalian heart is correct?

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

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Idiom
To stand to one's guns

To persevere when hardships press
To maintain one's position
To maintain dignified and unbending attitude
To keep the guns close to oneself even amid danger

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Idiom
To take the wind out of another's sails

To manouevre to mislead another on the high seas
To cause harm to another
To anticipate another and to gain advantage over him
To defeat the motives of another

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