Idiom
Select the correct statement about active and passive immunity.

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
A vaccination is an example of the introduction of passive immunity into the body

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Idiom
To turn over a new leaf

To shift attention to new problems
To change completely one's course of action
To change the old habits and adopt new ones
To cover up one's faults by wearing new masks

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