This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Q: Passage: An electromagnetic wave refractor in some aperture antennas is a component which due to its shape and position functions to selectively delay or advance portions of the electromagnetic wavefront passing through it. The refractor alters the spatial characteristics of the wave on one side relative to the other side. It can, for instance, bring the wave to a focus or alter the wave front in other ways, generally in order to maximize the directivity of the antenna system. This is the radio equivalent of an optical lens. Question: What is used to allow one to control the function of wave fronts moving through an antenna?

A: selectively delay
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Q: Passage: Following the end of World War II the educational gap between White and Black Americans was widened by Dwight D. Eisenhower's GI Bill. This piece of legislation paved the way for white GIs to attend college. Despite their veteran status returning black servicemen were not afforded loans at the same rate as whites. Furthermore, at the time of its introduction, segregation was still the law of the land barring blacks from the best institutions. Overall, "Nearly 8 million servicemen and servicewomen were educated under the provisions of the GI Bill after World War II. But for blacks, higher educational opportunities were so few that the promise of the GI Bill went largely unfulfilled." Question: What did returning black veterans not receive?

A: loans at the same rate as whites
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Q: Passage: Boston (pronounced i/ˈbɒstən/) is the capital and largest city of the Commonwealth of Massachusetts in the United States. Boston also served as the historic county seat of Suffolk County until Massachusetts disbanded county government in 1999. The city proper covers 48 square miles (124 km2) with an estimated population of 655,884 in 2014, making it the largest city in New England and the 24th largest city in the United States. The city is the economic and cultural anchor of a substantially larger metropolitan area called Greater Boston, home to 4.7 million people and the tenth-largest metropolitan statistical area in the country. Greater Boston as a commuting region is home to 8.1 million people, making it the sixth-largest combined statistical area in the United States. Question: What is the capital of Massachusetts?

A:
Boston
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