OE
The mantis shrimp has more color detecting cells than any other creature. “While one would think” indicates that the common or logical view will turn out to be incorrect. Certainly the logical deduction would be that these shrimp are good at seeing colors, so “discriminate” (which can mean to distinguish accurately) is the best choice for the first blank. The GRE will often use lesser known secondary meanings, as here with “discriminate.” “Distort” is a reversal trap and “improve” does not fit the desired meaning. The second blank should contrast what “one would think.” It turns out that they can’t actually see more colors, so this claim is false, or “baseless” (without basis in fact). “Obvious” and “illiberal” (narrow-minded) do not mean false.
Answer: B,D