6

Set 1: Words in Context (Advanced)

Explanation

Answer: B

PASSAGE

The bacterial strain proved ______ to the new antibiotic, continuing to proliferate despite high concentrations of the drug.

Which choice completes the text with the most logical and precise word or phrase?

A. susceptible
B. impervious✓ Correct
C. conducive
D. symbiotic

Detailed Explanation

If it continues to grow ('proliferate') despite the drug, the drug isn't working. 'Impervious' means unable to be affected by.

Key Evidence:

• "continuing to proliferate"

• "despite high concentrations"

Why others are wrong: A (Susceptible means easily harmed by.), C (Conducive means helpful.), D (Symbiotic implies a mutually beneficial relationship.).

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