GRE考试

根据网考网考试中心的统计分析，以下试题在2019/6/2日GRE考试习题练习中，答错率较高，为：82%
【单选题】Hydrothermal vents along the mid-ocean ridges host ephemeral ecosystems of diverse fauna, including several crustacean species, some of which undergo development as larvae up to 1,000 meters above and 100 kilometers away from the vents. For example, vent crabBythograea thermydron (at stage of larvae) possess image-forming compound eyes with a visual pigment sensitive to the blue light of upper oceanic waters.As these larvae metamorphose into adulthood and begin to descend to and settle at the vents, they lose their imageforming optics and develop highsensitivity naked-retina eyes. With maturation,the spectral absorbance of the visual pigment in these eyes also shifts towards longer wavelengths and this progressive visual metamorphosis trades imaging for increased sensitivity, and changes spectral sensitivity to the dim, longer wavelengths of light existing at the bottom of the ocean.As hydrothermal vents produce light, vision may supplement thermal and chemical senses to orient post-larval settlement at vent sites.It may be inferred from the passage that the larval environment which surrounds the vent crabBythograea thermydron differs from its adult environment in that it________.
A、contains more thermal vents than the adult environment
B．receives more of its light from the sun than from hydrothermal vents
C．lacks the longer and dimmer wavelengths of light found in the adult environment
D．can be survived only by creatures equipped with image-forming optics
E．has a tendency to induce metamorphoses in the creatures that occupy it

网考网参考答案：B，答错率：82%
网考网试题解析：
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