medium · SAT Reading & Writing
Physicists have successfully used 'superconductors'—materials that can conduct electricity without resistance—to create powerful magnets for medical imaging. While these materials currently only function at extremely low temperatures, researchers are racing to develop 'room-temperature' superconductors that would revolutionize the energy grid. Such a breakthrough would allow for the long-distance transmission of electricity with zero loss of power.
Which choice best describes the function of the underlined sentence as a whole?
- It describes a current technical limitation and identifies a potential future breakthrough.
- It confirms that room-temperature superconductors were already implemented in the energy grid in 2022.
- It proves that electricity cannot be transmitted over distances greater than ten miles.
- It argues that modern medical imaging is too expensive because it relies on magnetism.
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