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Difficulty: MediumTransitions: Contrast and Concession

In 2020, astronomers announced the detection of phosphine gas in the atmosphere of Venus, a chemical that on Earth is primarily produced by anaerobic microbes. This discovery generated excitement as a potential signature of extraterrestrial life. __________, subsequent analyses of the data by independent research teams suggested that the spectral signal could be explained by sulfur dioxide, a common volcanic gas, or was simply the result of instrumental noise.

Which choice completes the passage with the most logical transition?

  1. A
    Consequently,
  2. B
    Furthermore,
  3. However,Answer
  4. D
    Similarly,

Answer

However,
The correct choice is the option containing 'However,' because it correctly signals a contrast between the initial excitement about a potential biosignature on Venus and the subsequent skeptical analyses proposing abiotic explanations.

Step-by-Step Solution

1
Analyze the relationship between the ideas before and after the blank.
The text before the blank describes the excitement about finding a potential biosignature (phosphine) on Venus, while the text after the blank describes subsequent skeptical analyses suggesting non-biological sources or noise.
Understanding the semantic relationship between the sentences is required to select the correct transition.
2
Determine the required transition type.
The second sentence introduces an opposing viewpoint or qualification to the first, meaning a transition signaling contrast or concession is needed.
A contrast transition is the only logical way to connect these two opposing ideas.
3
Evaluate the choices to identify the option that represents a contrast transition.
'However,' is a contrast transition. 'Consequently,' indicates cause-and-effect; 'Furthermore,' indicates addition; and 'Similarly,' indicates comparison.
Selecting the transition that aligns with the contrast relationship ensures logical cohesion.

Key Concept

Transitions: Contrast and Concession
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Topics

Transitions: Contrast and Concession

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