New strains of the flu that appear each year can ...

[ Vocabulary ]

New strains of the flu that appear each year can often be very __________________, which is why the Centers for Disease Control continue to recommend vaccinations.

A. indomitable

B. diffident

C. virulent

D. truculent

Select your answer:
A B C D E

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Grammar, Literature, and Vocabulary State Verbs and Action Verbs Order of Adjectives Transitional Phrases and Conjunctions Subordinating Conjunctions Time Conjunctions Future or Past Language Features of an Opinion Article Clauses of Reason The Structural Types of Sentences

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