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The "dark cloud" mentioned in line 4 refers to an

(A) atypical diagnosis
(B) unsupported hypothesis
(C) unknown threat
(D) evil influence
(E) important contradiction

User Zaknotzach
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1 Answer

4 votes

Answer:

  • Option (E)
    \implies Important contradiction

Step-by-step explanation:

The passage states that, even in the midst of some great scientific achievement, history-physicists have been aware of some 'dark clouds looming on a distant horizon'. "Dark clouds looming on a distant horizon" implies some important contradictions to the achievements already made by the history-physicist. Thus E is the answer.

User Noodl
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