4

Set 2: Form, Structure & Sense

Explanation

Answer: A

PASSAGE

Recent studies show that unlike reptiles, _______ maintain a constant body temperature regardless of their environment.

Which choice completes the text so that it conforms to the conventions of Standard English?

A. mammals✓ Correct
B. it is mammals that
C. the body temperature of mammals is controlled, and they
D. mammals, which

Detailed Answer Explanation

[Variation 1] This question tests your understanding of sentence function and text organization. The comparison 'Unlike reptiles' must be followed by a noun that can be logically compared to reptiles. 'Mammals' creates a parallel comparison between two groups of animals. Each sentence in a well-constructed text serves a specific purpose. Consider what role this sentence plays in the argument: does it introduce, support, contrast, or conclude an idea? Understanding why an author includes specific sentences helps you grasp the overall argument. Each sentence should serve a clear purpose: introducing ideas, providing evidence, acknowledging counterarguments, or drawing conclusions. Identify the role to understand the structure.

Key Evidence:

• "Unlike reptiles"

• "maintain a constant body temperature"

Why others are wrong: B ('It is mammals that' is awkward and doesn't maintain parallel structure with 'reptiles.'), C (Compares 'reptiles' to 'body temperature,' which is illogical.), D ('Mammals, which' creates an incomplete relative clause without a main verb continuation.).