Multiple choice

Directions: Fill in the blank with the most appropriate word.

Scientists are on the ________ of a major breakthrough in cancer treatment.

  1. periphery

  2. threshold

  3. gateway

  4. frontier
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Option 1 and 4 are incorrect and irrelevant here. Option 2 i.e. 'threshold' means 'the entrance or beginning point of something'. The sentence implies the same, and hence it is the right answer.

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