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1. At the heart of a comer’s coma lies a nucleus of solid material, typically no more than 10 kilometers across.
The word “heart” is closest in meaning to which of following?
(A) center (B) edge (C) tail (D) beginning
2. The most graphic proof that the grand spectacle of a comet develops from a relatively small and inconspicuous chunk of ice and dust was the close-up image obtained in 1986 by the European Giotto probe of the nucleus of Halley’s Comet.
The word “graphic” is closest in meaning to which of following?
(A) mathematical (B) popular (C) unusual (D) vivid
3. As a comet’s orbit brings it closer to the Sun, first the coma grows, then two distinct tails usually form.
The word “distinct” is closest in meaning to which of following?
(A) visible (B) gaseous (C) separate (D) new