The Apollo Moon landings (1969–1972) brought radiation detectors and equipment too heavy for liftoff to the Moon and produced large amounts of data. Researcher Philip Metzger, who is investigating the long-term effects of being on the Moon, continues to use Apollo’s data, demonstrating that the missions’ value to science is __________.
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Verbal·Craft and Structure·Words in Context
easyWhich choice completes the text with the most logical and precise word or phrase?
A
ongoing
B
original
C
displaced
D
controversial