Which of the following is the most logi… | [국회직 8급 영어] 21년 1회차 기출문제 상세 페이지

Which of the following is the most logical sequence of the four parts to complete the passage?
According to the theories of physics, if we were to look at the Universe one second after the Big Bang, what we would see is a 10-billion degree sea of neutrons, protons, electrons, anti-electrons (positrons), photons, and neutrinos.
(A)As it continued to cool, it would eventually reach the temperature where electrons combined with nuclei to form neutral atoms.
(B)But when the free electrons were absorbed to form neutral atoms, the Universe suddenly became transparent.
(C)Then, as time went on, we would see the Universe cool, the neutrons either decaying into protons and electrons or combining with protons to make deuterium (an isotope of hydrogen).
(D)Before this "recombination" occurred, the Universe would have been opaque because the free electrons would have caused light (photons) to scatter the way sunlight scatters from the water droplets in clouds.
Those same photons―the afterglow of the Big Bang known as cosmic background radiation―can be observed today.

(A) - (B) - (C) - (D)

(A) - (C) - (B) - (D)

(B) - (A) - (D) - (C)

(C) - (A) - (D) - (B)

(C) - (D) - (B) - (A)

올바른 순서는 (C) - (A) - (D) - (B)이다.
빅뱅 1초 후의 모습 다음에는 “Then, as time went on”으로 냉각을 시작하는 (C)가 온다. 이어 “As it continued to cool”로 중성 원자 형성을 말하는 (A), 이를 “this "recombination"”으로 받아 불투명했다고 설명하는 (D), “But”으로 투명해진 변화를 말하는 (B) 순서이다. 이때 산란에서 풀려난 (D)의 빛(photons)이 마지막 문장의 “Those same photons”로 이어진다.
(A) - (B) - (C) - (D): “continued to cool”이 첫 냉각 언급인 (C)보다 앞설 수 없다.
(A) - (C) - (B) - (D): 역시 (A)가 (C)보다 앞서 냉각의 흐름이 뒤집힌다.
(B) - (A) - (D) - (C): (B)의 “But”이 대조할 불투명 상태 설명 없이 먼저 나올 수 없다.
(C) - (D) - (B) - (A): (D)의 “this recombination”이 가리킬 (A)의 원자 결합보다 앞서 나온다.