The question requires filling in blanks in a sentence to ensure it makes logical sense. By analyzing the sentence, "Our Constitution is so simple and __________ that it is always possible to meet extraordinary needs by changes in emphasis and arrangement without loss of essential __________," we need words that describe a constitution that is adaptable yet retains its core essence.
Let's evaluate the options:
- "Rational ... notion": This suggests a logical yet abstract concept, which does not precisely fit the context.
- "Comprehensible ... norm": While "comprehensible" suggests understanding, "norm" implies a standard, which doesn't complement the need to retain essential elements.
- "Practical ... form": "Practical" fits well with a system that can easily adapt to changes, while "form" supports maintaining essential structure during modifications.
- "Realistic ... ideology": Although "realistic" indicates practicality, "ideology" implies a set of ideas rather than a flexible structure that retains core elements.
Among these, "practical ... form" aligns perfectly with the needs of a constitution that is adaptable while maintaining its essential structure.