Question

Water boils ____ 100 degree Celsius.

• A. in
• B. at
• C. by
• D. for

Answer 1

Answer:

B. at

We use "at" when referring to specific temperatures, times, or points.

• Example:

  • "The meeting starts at 10 AM."

  • "Water freezes at 0°C."

  • "Iron melts at 1538°C."