سوال ۲ کنکور ارشد مهندسی کامپیوتر ۱۴۰۴
Choose the word that best completes the sentence.
Is it true that the greenhouse __________, the feared heating of the earth's atmosphere by burning coal and oil, is just another false alarm?
پاسخ صحیح: گزینهٔ A — effect
The fixed scientific collocation is greenhouse effect — the standard term for the warming of the earth's atmosphere caused by gases released when coal and oil are burned. The appositive that follows the blank ("the feared heating of the earth's atmosphere...") defines exactly this phenomenon, confirming the noun. The other nouns do not form an established term with greenhouse: greenhouse energy/force/warmth are not idiomatic.
Correct choice: (1) effect.
Exam trick: When a blank is immediately followed by a comma and a definition (an appositive), the blank usually completes a fixed term whose meaning equals that definition — here, greenhouse effect.