A.I. Explanation:

Correct answer: changed

Explanation: The word 'changed' fits grammatically as it is in the past participle form, aligning with the present perfect tense implied by 'have.' Contextually, it indicates that the meanings of health have evolved over time, which is the intended message of the sentence.

Meaning: 'Changed' means to have become different or to have undergone a transformation.

Wrong options:

• existed: 'Existed' suggests a state of being present but does not imply any alteration, making it contextually inappropriate here.
• vanished: 'Vanished' means to disappear completely, which contradicts the idea of meanings evolving over time.
• dropped: 'Dropped' implies a sudden loss or reduction, which does not align with the gradual evolution of meanings suggested in the text.

Correct answer: evident

Explanation: The word 'evident' is an adjective that fits grammatically as it describes the degree of difference, aligning with the comparative structure of the sentence. Contextually, it indicates that the differences in meanings of health are clear and observable, particularly in Western society.

Meaning: 'Evident' means clear to the sight or understanding; obvious.

Wrong options:

• identical: 'Identical' means exactly the same, which contradicts the idea of differences in meanings.
• unique: 'Unique' implies being one of a kind, which does not fit the comparative context of the sentence.
• raised: 'Raised' is a verb that does not fit grammatically or contextually, as it does not describe the nature of the difference.

Correct answer: notions

Explanation: The word 'notions' fits grammatically as a plural noun, which is appropriate in this context where multiple ideas or concepts are being discussed. Contextually, it refers to the various ideas about health that are currently being challenged.

Meaning: 'Notions' means ideas, beliefs, or concepts about something.

Wrong options:

• countours: 'Countours' is a misspelling of 'contours,' which refers to outlines or shapes, not fitting the context of ideas about health.
• figures: 'Figures' typically refers to numerical data or shapes, which does not align with the discussion of concepts or ideas.
• costs: 'Costs' refers to expenses, which is unrelated to the discussion of health concepts.

Correct answer: expanded

Explanation: The word 'expanded' fits grammatically as a past participle that complements the verb 'are being,' indicating an ongoing action. Contextually, it suggests that the ideas of health are being broadened or developed in new ways, which aligns with the overall message of the sentence.

Meaning: 'Expanded' means to increase in size, number, or importance; to develop further.

Wrong options:

• emitted: 'Emitted' means to send out or release, which does not fit the context of developing ideas.
• served: 'Served' implies providing a service or function, which is not relevant to the context of health concepts being challenged.
• dictated: 'Dictated' means to control or determine, which does not align with the idea of ideas being broadened.