Idiom
Select the correct statement about active and passive immunity.

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
Immunological memory is established by passive immunization
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies

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Idiom
To plough the sands

To work hard to achieve one's aim
To advance one's position in life
To busy oneself in a way which cannot lead to any profitable result
To afford hope or ground for expecting a good result

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