سوال ۲ کنکور ارشد مهندسی برق ۱۴۰۴
PART A: Vocabulary — Choose the word or phrase (1), (2), (3), or (4) that best completes the sentence.
The weakened ozone «..........», which is vital to protecting life on Earth, is on track to be restored to full strength within decades.
پاسخ صحیح: گزینهٔ A — layer
The sentence needs the noun that goes with ozone to name the protective band of gas in the stratosphere. The fixed collocation is ozone layer — a layer is a sheet or stratum of a substance lying over a surface, exactly what shields Earth from ultraviolet radiation and what the sentence says is "vital to protecting life on Earth" and can be "restored to full strength".
- level = a height, degree, or amount on a scale ("ozone levels rose"), not a physical protective sheet; it would not be described as weakened and restored to full strength as a single entity introduced by The.
- brim = the rim/edge of a cup or hat — unrelated.
- ingredient = a component of a mixture or recipe; ozone is not an ingredient that protects life.
Exam trick: Choices 1 and 2 are both plausible "amount/position" nouns; the singular definite phrase The weakened ozone … plus restored to full strength points to the physical shield, i.e. the standard collocation ozone layer.