Select the phrasal verb meaning to focus directly and precisely upon a target:
Using satellite radiometric imaging, glaciologists were able to ________ the precise fault line where the ice shelf is fracturing.
Answer and explanation
Correct answer: C. zero in on
Answer: zero in on. Why not the others: 'back out of' means to withdraw from an agreement; 'brush up on' means to refresh one's memory; 'run out of' means to exhaust a supply.
- Step 1: Determine the meaning needed: scientists directed their instruments with high precision toward the specific crack location.
- Step 2: 'Zero in on' means to focus one's attention, aim, or investigative efforts precisely onto a specific target or issue.
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