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Question

Difficulty: EasySequential Detail Extraction

When collecting water samples from a deep borehole for chemical analysis, technicians must adhere to a strict sequence to prevent contamination. First, the wellhead cap is sanitized with an isopropyl alcohol wipe. Next, the pump is run for five minutes to purge stagnant water from the riser pipe. Before collecting the water into sterile borosilicate bottles, the field technician must measure and record the baseline temperature and pH levels. Finally, the filled bottles are sealed and immediately placed into an insulated cooler with ice packs.

According to the passage, which action must the technician complete immediately before collecting the water into sterile bottles?

  1. A
    Sanitize the wellhead cap with an alcohol wipe
  2. Measure and record baseline temperature and pH levelsAnswer
  3. C
    Run the pump for five minutes to purge stagnant water
  4. D
    Place the sealed bottles into an insulated cooler with ice packs

Answer

Measure and record baseline temperature and pH levels
The passage uses the explicit temporal indicator 'Before collecting the water...' to specify that measuring and recording baseline temperature and pH levels is the mandatory step carried out directly prior to sample collection.

Step-by-Step Solution

1
Locate the target event in the passage
Identified the target milestone: 'collecting the water into sterile borosilicate bottles'.
Establishing the anchor event allows for precise identification of adjacent chronological steps.
2
Identify the chronological transition marker preceding the anchor event
Found the explicit cue: 'Before collecting the water into sterile borosilicate bottles, the field technician must measure and record the baseline temperature and pH levels.'
The preposition 'before' directly introduces the immediate precursor action.
3
Match the extracted detail to the corresponding answer choice
Confirmed that measuring and recording baseline temperature and pH levels directly matches the required precursor.
Ensures the selected option represents the exact factual sequence described in the text.

Key Concept

Sequential Detail Extraction
Estimated Time:45s
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Topics

Sequential Detail Extraction

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