大学入学共通テスト（英語） 過去問
令和7年度（2025年度）本試験
問43 (英語リーディング（第8問） 問6)
問題文
各大問の英文や図表を読み、最も適当な選択肢を選びなさい。
You are working on an essay about space exploration. You will follow the steps below：
Step 1：Read a range of opinions gathered from the Internet about exploring outer space.
Step 2：Take a position on space exploration.
Step 3：Create an outline of your essay using additional sources.
▶［Step 3］Create an outline of your essay
Essay outline
A Reconsideration of Space Exploration
Introduction
Space exploration is without doubt on the frontline of science，but it should not be a priority for the following three reasons.
Body
REASON 1 from Step 2，based on evidence from the opinions in Step 1
REASON 2（ 43 ），based on evidence from Source A
REASON 3，based on evidence（ 44 ）from Source B
Conclusion
Upon consideration of all its aspects，we should perhaps prioritize other things over exploring space.
Source A
Although you may not make a direct connection between space exploration and environmental problems，a connection does exist. First，the CO2 emissions of spacecraft are not insignificant. It is estimated that one spacecraft launch emits 200−300 tons of CO2 and other harmful gases into the Earth’s atmosphere. More and more spacecraft are being sent into space，which is damaging for the Earth.The contribution to the greenhouse effect of these craft’s CO2 emissions is causing the Earth’s temperature to rise.Second，space exploration is damaging the thermosphere（the space environment close to the Earth）. The quantity of space debris，the junked parts of spacecraft or artificial satellites，is on the rise. NASA estimates that，in the thermosphere，there are currently around 23，000 pieces of space debris which are larger than a softball and travel at speeds of up to 28，000 km／h. This poses a risk to future spaceflight，and may even be a potential obstacle to astronomical observation.
Source B
Space exploration is getting more and more costly; in 2022 it was reported that the total amount of money spent by all the governments around the world was more than US$100 billion. The graph below compares this cost with the annual budgets，estimated by international institutions，that would be required to address some of the world’s most important issues.
Based on Source A，which of the following is the most appropriate for REASON 2？（ 43 ）
You are working on an essay about space exploration. You will follow the steps below：
Step 1：Read a range of opinions gathered from the Internet about exploring outer space.
Step 2：Take a position on space exploration.
Step 3：Create an outline of your essay using additional sources.
▶［Step 3］Create an outline of your essay
Essay outline
A Reconsideration of Space Exploration
Introduction
Space exploration is without doubt on the frontline of science，but it should not be a priority for the following three reasons.
Body
REASON 1 from Step 2，based on evidence from the opinions in Step 1
REASON 2（ 43 ），based on evidence from Source A
REASON 3，based on evidence（ 44 ）from Source B
Conclusion
Upon consideration of all its aspects，we should perhaps prioritize other things over exploring space.
Source A
Although you may not make a direct connection between space exploration and environmental problems，a connection does exist. First，the CO2 emissions of spacecraft are not insignificant. It is estimated that one spacecraft launch emits 200−300 tons of CO2 and other harmful gases into the Earth’s atmosphere. More and more spacecraft are being sent into space，which is damaging for the Earth.The contribution to the greenhouse effect of these craft’s CO2 emissions is causing the Earth’s temperature to rise.Second，space exploration is damaging the thermosphere（the space environment close to the Earth）. The quantity of space debris，the junked parts of spacecraft or artificial satellites，is on the rise. NASA estimates that，in the thermosphere，there are currently around 23，000 pieces of space debris which are larger than a softball and travel at speeds of up to 28，000 km／h. This poses a risk to future spaceflight，and may even be a potential obstacle to astronomical observation.
Source B
Space exploration is getting more and more costly; in 2022 it was reported that the total amount of money spent by all the governments around the world was more than US$100 billion. The graph below compares this cost with the annual budgets，estimated by international institutions，that would be required to address some of the world’s most important issues.
Based on Source A，which of the following is the most appropriate for REASON 2？（ 43 ）
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問題
大学入学共通テスト（英語）試験 令和7年度（2025年度）本試験 問43（英語リーディング（第8問） 問6） （訂正依頼・報告はこちら）
各大問の英文や図表を読み、最も適当な選択肢を選びなさい。
You are working on an essay about space exploration. You will follow the steps below：
Step 1：Read a range of opinions gathered from the Internet about exploring outer space.
Step 2：Take a position on space exploration.
Step 3：Create an outline of your essay using additional sources.
▶［Step 3］Create an outline of your essay
Essay outline
A Reconsideration of Space Exploration
Introduction
Space exploration is without doubt on the frontline of science，but it should not be a priority for the following three reasons.
Body
REASON 1 from Step 2，based on evidence from the opinions in Step 1
REASON 2（ 43 ），based on evidence from Source A
REASON 3，based on evidence（ 44 ）from Source B
Conclusion
Upon consideration of all its aspects，we should perhaps prioritize other things over exploring space.
Source A
Although you may not make a direct connection between space exploration and environmental problems，a connection does exist. First，the CO2 emissions of spacecraft are not insignificant. It is estimated that one spacecraft launch emits 200−300 tons of CO2 and other harmful gases into the Earth’s atmosphere. More and more spacecraft are being sent into space，which is damaging for the Earth.The contribution to the greenhouse effect of these craft’s CO2 emissions is causing the Earth’s temperature to rise.Second，space exploration is damaging the thermosphere（the space environment close to the Earth）. The quantity of space debris，the junked parts of spacecraft or artificial satellites，is on the rise. NASA estimates that，in the thermosphere，there are currently around 23，000 pieces of space debris which are larger than a softball and travel at speeds of up to 28，000 km／h. This poses a risk to future spaceflight，and may even be a potential obstacle to astronomical observation.
Source B
Space exploration is getting more and more costly; in 2022 it was reported that the total amount of money spent by all the governments around the world was more than US$100 billion. The graph below compares this cost with the annual budgets，estimated by international institutions，that would be required to address some of the world’s most important issues.
Based on Source A，which of the following is the most appropriate for REASON 2？（ 43 ）
You are working on an essay about space exploration. You will follow the steps below：
Step 1：Read a range of opinions gathered from the Internet about exploring outer space.
Step 2：Take a position on space exploration.
Step 3：Create an outline of your essay using additional sources.
▶［Step 3］Create an outline of your essay
Essay outline
A Reconsideration of Space Exploration
Introduction
Space exploration is without doubt on the frontline of science，but it should not be a priority for the following three reasons.
Body
REASON 1 from Step 2，based on evidence from the opinions in Step 1
REASON 2（ 43 ），based on evidence from Source A
REASON 3，based on evidence（ 44 ）from Source B
Conclusion
Upon consideration of all its aspects，we should perhaps prioritize other things over exploring space.
Source A
Although you may not make a direct connection between space exploration and environmental problems，a connection does exist. First，the CO2 emissions of spacecraft are not insignificant. It is estimated that one spacecraft launch emits 200−300 tons of CO2 and other harmful gases into the Earth’s atmosphere. More and more spacecraft are being sent into space，which is damaging for the Earth.The contribution to the greenhouse effect of these craft’s CO2 emissions is causing the Earth’s temperature to rise.Second，space exploration is damaging the thermosphere（the space environment close to the Earth）. The quantity of space debris，the junked parts of spacecraft or artificial satellites，is on the rise. NASA estimates that，in the thermosphere，there are currently around 23，000 pieces of space debris which are larger than a softball and travel at speeds of up to 28，000 km／h. This poses a risk to future spaceflight，and may even be a potential obstacle to astronomical observation.
Source B
Space exploration is getting more and more costly; in 2022 it was reported that the total amount of money spent by all the governments around the world was more than US$100 billion. The graph below compares this cost with the annual budgets，estimated by international institutions，that would be required to address some of the world’s most important issues.
Based on Source A，which of the following is the most appropriate for REASON 2？（ 43 ）
- CO2 emissions produced by spacecraft are huge and are damaging outer space.
- It is difficult to update spacecraft with new engines that emit fewer harmful gases.
- Space debris poses risks to humans due to potential collision with airplanes.
- Space exploration is polluting the environment of both the Earth and the thermosphere.
正解！素晴らしいです
残念...
この過去問の解説 （1件）
01
問題文は
「ソースAに基づくと、どれが理由2に最も当てはまるか」
です。
Source Aを見てみます。
まずは出だし。
Although you may not make a direct connection between space exploration and environmental problems，a connection does exist.
（宇宙探索と環境問題に直接的な関連はないと思うかもしれませんが、関連は実は存在します。）
要するに、宇宙探索は環境に影響があるという趣旨のものを選ぶことになります。
2つの具体例の記述を取り上げます。
First，the CO2 emissions of spacecraft are not insignificant.
（まず、宇宙船の二酸化炭素排出は微々たるものではありません)
Second，space exploration is damaging the thermosphere（the space environment close to the Earth）.
（二つ目に、宇宙探索は熱圏(地球の近くの宇宙環境)にダメージを与えます。)
要するに、二酸化炭素排出による地球の環境汚染と、地球の周囲の宇宙空間へのダメージが問題だとわかります。
環境の話をしているものをまずは絞りながら解きましょう。
「宇宙船による二酸化炭素排出は大きく、宇宙空間へダメージを与えている」
おしいですが、地球にも害があるので違います。
「より有害でないガスを排出する新しいエンジンを備えた宇宙船をアップデートするのは困難だ」
「宇宙のゴミは飛行機との衝突の可能性のため、人間にリスクを及ぼす」
正解 「宇宙探査は地球と熱気圏の両方の環境を汚染している」
全てを満たしています。
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