Idiom
The arrival of the mother-in-law in the family proved a rift in the lute.

brought about disharmony
caused a pleasant atmosphere
caused unnecessary worries
brought about a disciplined atmosphere

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Idiom
Select the correct statement about active and passive immunity.

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

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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. If we give them this concession, it will be the thin end of the wedge.

inadequate for their needs
a compromise on principles
the beginning of further concessions
the least we could do for them

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