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Difficulty: HardSentence-Level Transitions

Although standard light-emitting diodes (LEDs) had been producing red and green light since the 1960s, a blue LED remained notoriously difficult to create. Without a blue light source, scientists could not combine the primary colors of light to produce white light, stalling the development of energy-efficient household illumination. [1] Consequently, researchers at chemical companies and universities continued to focus their efforts on gallium nitride, a material widely considered too volatile to work with.

Which choice most effectively establishes a logical transition between the second and third sentences of the passage?

  1. A
    NO CHANGE
  2. Nonetheless,Answer
  3. C
    For instance,
  4. D
    Furthermore,

Answer

Nonetheless,
The correct option 'Nonetheless,' is correct because it establishes a contrast relationship. The passage discusses a major roadblock—the inability to produce white light and the resulting stall in household illumination. Despite this setback, researchers continued their work. 'Nonetheless' correctly indicates that this work continued in spite of the previously mentioned challenges.

Step-by-Step Solution

1
Analyze the context of the sentence preceding the transition.
The second sentence explains that the lack of a blue LED prevented the production of white light, which stalled the development of energy-efficient household illumination.
To choose the correct transition, we must understand the logical relationship between the preceding information and the sentence containing the transition.
2
Analyze the context of the sentence containing the transition.
The third sentence describes how researchers continued to focus their efforts on a volatile material (gallium nitride) to create the blue LED.
This helps determine if the relationship is addition, contrast, cause-and-effect, or illustration.
3
Evaluate the logical relationship between the two sentences and select the appropriate transition.
Since researchers continued their difficult work despite the stalled progress and volatile materials, the relationship is contrast. 'Nonetheless,' is the only option that signals contrast.
Using the correct transition establishes a clear and logical connection that matches the author's meaning.

Key Concept

Sentence-Level Transitions
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Topics

Sentence-Level Transitions

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