Idiom
Despite the trust bestowed on the minister he turned out to be a snake in the grass during the revolution.

a treacherous person
an unexpected misfortune
a secret enemy
an unforeseen danger

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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
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

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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. Despite being under debt, Amit still keeps a good table.

helps his friends with money
keeps up an outward show of prosperity
entertains his guests sumptuously
is lively and gay when his friends call

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