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

Topics: 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:

Random Topics:

Grammar - TOEIC WH- Question Words Figurative Language Vocabulary Comparative & Superlative Adverbs Singular and Plural Nouns Basic Tenses The Future Simple Tense -ing &-ed Adjectives Nouns Formation Simple Past Tense

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