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...
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