Direction: In the following questions four alternatives are given for the Idiom/Phrase in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/Phrase.
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Scientific knowledge is no longer a closed book in this 21st century.
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- an unopened book
- a covered book
- a mystery
- a mysterious book
Correct Option: A
a closed book : a person that you know nothing about
● I can’t figure her out; she’s a closed book to me. The best option is a mystery.
