Idiom
To plough the sands

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

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. Swan-song

Last work of a poet or musician before death
A melodious song in praise of someone
Praise of a woman by her lover
Music as sweet as a song of birds

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Idiom
Select the correct statement about active and passive immunity.

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

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