Set 3: Words in Context (Advanced)

Explanation

Answer: B

PASSAGE

The phenomenon is difficult to observe directly because it is ______, appearing only for microseconds before vanishing.

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

A. perennial

B. ephemeral✓ Correct

C. enduring

D. tangible

Detailed Explanation

Something lasting only microseconds is short-lived. 'Ephemeral' means lasting for a very short time.

Key Evidence:

• "appearing only for microseconds"

• "vanishing"

Why others are wrong: A (Perennial means lasting a long time.), C (Enduring means lasting.), D (Tangible means touchable.).