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. A snake in the grass

Irreliable person
Unrecognisable danger
Unforeseen happening
Secret or hidden enemy

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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
Immunological memory is established by passive immunization
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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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. It is no longer easy to strike gold in Shakespeare's research since much work has already been done on him.

Come across gold
Hit a golden spot
Come across the word "gold"
Uncover or find a valuable line of argument or information

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