Theory:

But the question for which I awarded the highest score came from a labourer digging a hole in the street. I was still far from him when he laid down his tool, put his hands on his hips, and began to stare. As I drew nearer I saw his expression of surprise and affront, as though he would have me know that he was not one upon whom to play jokes. I came abreast of him; he spat, glared, and then growled out, “Here, Mister — what is that supposed to be?”

Explanation:

 

The worker who was excavating a hole gave the most startling response while pausing to observe Mij. He set his tool down, put his hands behind his back, and fixed his gaze on Mij. His surprised and offended facial expressions made it clear that he would not put up with any bullshit. He spat, glared at them, and shouted at the author, "What was that intended to be, Mijbil?"

 

Meanings of difficult words:

 
Sl. No
Words
Meanings
1
ValleyA low area of land between hills or mountains, typically with a river or stream flowing through it
2
CrestThe top of a mountain or hill
3
RipeHaving arrived at the fitting stage or time for a particular action or purpose
4
DownpourA heavy fall of rain
5
ShowerA brief and usually light fall of rain, hail, sleet, or snow
6
IntimatelyIn a way that involves detailed knowledge
Reference:

National Council of Educational Research and Training (2007). First Flight. Mijbil the Otter - Gavin Maxwell (pp. 102 - 110). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi..