4
Answer: ASet 4: Words in Context
Explanation
PASSAGE
The discovery of gold in California led to a massive ______, with thousands of people rushing to the state in search of fortune.
Which choice completes the text with the most logical and precise word or phrase?
A. migration✓ Correct
B. drought
C. silence
D. decline
Detailed Explanation
Thousands of people moving to a new place is a 'migration'.
Key Evidence:
• "thousands of people rushing to the state"
Why others are wrong: B (Drought is a lack of rain.), C (Silence is the absence of sound.), D (Decline means a decrease, but the population increased.).