Before the Mariner 2 mission completed a successful flyby of Venus in 1962, astronomers’ ideas about the planet were little more than __________. Venus’s atmosphere is so thick that Earth-based observations had yielded very little information about the planet.
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Verbal·Craft and Structure·Words in Context
mediumWhich choice completes the text with the most logical and precise word or phrase?
A
conclusions
B
summations
C
conjectures
D
exemplifications