Idiom
He sold his house for a song.

very cheaply
at a premium
at a discount
at a reasonable price

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Idiom
To cool one's heel

To be kept awaiting someone
To rest for sometime
To remain in a comfortable position
To give no importance to someone

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Idiom
Select the correct statement about active and passive immunity.

A vaccination is an example of the introduction of passive immunity into the body
Immunological memory is established by passive immunization
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
The antibodies utilized in active immunity are acquired from another organism

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