سوال ۳ کنکور ارشد ریاضی ۱۴۰۰

The clause "be sure to bring a first-aid kit" signals risk of injury, so the blank needs an adjective meaning dangerous.

• (4) perilous = full of danger, risky — exactly the property of a journey that would make first-aid supplies necessary. ✔
• (1) courageous = brave; it describes a person, not a journey, and bravery is not a reason to pack bandages.
• (2) cautious = careful, avoiding risk; again a trait of a person, and a "cautious" trip would suggest less need for emergency gear — the opposite of the logic marked by Since … be sure to.
• (3) enormous = very large in size; a long or big trip does not by itself imply injury, and it misses the danger cue entirely.

Exam trick: the second clause is the clue. When a sentence prescribes a precaution (first-aid kit, helmet, insurance), the blank almost always carries a danger meaning — scan the options for the one risk word (perilous, hazardous, treacherous) rather than for a positive-sounding one.