Logical reasoning PrepTest 138 · Section 2 · Question 1

Incorrect. There's no prediction made about the future nor discussion of what might happen, and no note that suggests people aren't interested in changing the lab mice conditions.

Incorrect. First, "better" could still be abnormal—they could be kept in climate-controlled, pillow-filled cages with tons of food, which wouldn't be the norm for mice. Second, the stimulus isn't about what's "appropriate," but rather what's reliable.

Correct. Argument or Facts:
Facts

Question Type:
Must Be True

Stimulus Summary:
Lab mice are kept in unhealthy and abnormally small cages, and animal testing is unreliable if there are abnormal conditions.

Answer Anticipation:
The inference that leads to the correct answer in a Must Be True question frequently comes from combining two statements that share a term. Here, the first and second statement both talk about abnormal environments—lab mice are usually kept in an abnormal environment, and that "diminish[es]" the reliability of the research. This inference is likely to be the correct answer, so let's find it!

Answer Explanation:
This answer paraphrases our anticipation. The reliability of the research is diminished by the mice being kept in abnormal conditions, thus compromising that research.

Key Takeaway:
In Must Be True questions, look for statements that share terms or concepts. Inferences frequently come from the combination of two or more such statements.

Incorrect. There's no indication that anyone is working on creating new research techniques—scientists might accept the lowered reliability because of ease of using mice kept in small cages.

Incorrect. The stimulus only discusses mice used for research aimed at improving human health, so this answer is out of scope.