Explanation


there is nothing that makes more upset scientists than an observation that comes from another field. An example could be cited the derogatory answer gave to the hypothesis of the dinosaurs extinction.
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why not exposition for second blanks ?kindly explain it

The first sentence is a fact : something truly upset the scholar.

The second sentence says to understand and see this in reality is enough that we observe or the observation.

Exposition is clearly wrong and out of scope under this view

Regards
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There is nothing that (i) ________ scientists more than having an old problem in their field solved by someone from outside. If you doubt this (ii) ___________ , just think about the (iii) __________ reaction of paleontologists to the hypothesis of Luis Alvarez—a physicist—and Walter Alvarez—a geologist—that the extinction of the dinosaurs was caused by the impact of a large meteor on the surface of the plane.

There is the possibility that the scientists were either amazed, pleased (unlikely) or nettled by someone from outside solving an old problem in their field. How do we decide for sure? The second sentence is an example of the proposition made in the first sentence. The third blank describes the reaction of the paleontologists to scientists outside their domain solving their problem. All three choices are negatives - contemptuous, indifferent and insincere. The paleontologists reaction wouldn't be any of these three if they were pleased or amazed by others solving problems in their own fields. So the word for the first blank has to be nettles.

And if they were nettled, which means irritated or annoyed, they wouldn't be just indifferent or insincere, but contemptuous towards the outsiders; because nettles is a strong word and requires a strong reaction.

Now the first sentence is a statement. It is not a detailed explanation (exposition) or a harsh reprimand or criticism (objurgation). Hence observation is the right word.
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Now, that's what I call a thorough explanation. Thanks

You are welcome
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