Q. Directions:- In the following questions, four alternatives are given for the Idiom/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/Phrase. Scientific knowledge is no longer a closed book in this 21st century - Study24x7
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Q. Directions:- In the following questions, four alternatives are given for the Idiom/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/Phrase.

Scientific knowledge is no longer a closed book in this 21st century

A

an unopened book

B

a covered book

C

a mystery

D

a mysterious book

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