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Question

Difficulty: HardMeeting Specific Rhetorical Goals

Passage Excerpt:

Before the invention of radar, the British military constructed acoustic mirrors along the Kent coast to detect the drone of approaching enemy aircraft. [Sentence] These monolithic structures functioned like giant ears, reflecting sound waves onto a central microphone. However, the rapidly increasing speed of modern aircraft in the late 1930s soon rendered this network obsolete.

Which choice most effectively emphasizes the immense scale and distinctive geometry of the acoustic mirrors, highlighting their visual impact on the coastline?

  1. Rising up to thirty feet high, the colossal concrete dish-like walls curved abruptly against the flat marshland.Answer
  2. B
    Built using local gravel and cement, the mirrors were positioned at precise angles to focus the acoustic signals.
  3. C
    Operating under the direction of the Acoustical Research Section, these devices could provide about fifteen minutes of warning time.
  4. D
    The massive concrete structures loomed over the beach, they were designed to detect the faint drone of distant aircraft.

Answer

Rising up to thirty feet high, the colossal concrete dish-like walls curved abruptly against the flat marshland.
The correct option is grammatically correct and satisfies all components of the prompt's rhetorical goal. It highlights scale using the words 'colossal' and 'thirty feet high,' presents a clear geometric description with 'dish-like' and 'curved abruptly,' and conveys visual impact on the coastline with the contrast of the walls 'against the flat marshland.'

Step-by-Step Solution

1
Analyze the prompt to identify the specific rhetorical goals.
The prompt requires a choice that emphasizes three distinct elements: (1) immense scale, (2) distinctive geometry, and (3) visual impact on the coastline.
Understanding the exact criteria of the rhetorical goal is necessary to evaluate the options.
2
Evaluate each option for grammatical correctness.
The options detailing the creation with local gravel, the administrative warning times, and the rising dish-like walls are grammatically correct. However, the option starting with 'The massive concrete structures loomed...' contains a comma splice, joining two independent clauses with only a comma, making it grammatically incorrect.
ACT English requires the correct answer to be both grammatically correct and rhetorically appropriate.
3
Evaluate the grammatically correct options against the rhetorical goals.
The option about local gravel and cement focuses on materials and physics. The option about warning times focuses on operational metrics. The option starting with 'Rising up to thirty feet high' directly addresses scale ('thirty feet high', 'colossal'), geometry ('dish-like', 'curved abruptly'), and coastal visual impact ('against the flat marshland').
Comparing the remaining options ensures that only the one meeting all prompt criteria is selected.

Key Concept

Meeting Specific Rhetorical Goals
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Topics

Meeting Specific Rhetorical Goals

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