Idiom
The class could not keep a straight face on hearing the strange pronunciation of the new teacher.

remain silent
remain mute
remain serious
remain disturbed

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Idiom
Select the correct statement about active and passive immunity.

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

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