EigoPro 準1級 読解 — The Power of Maps

We tend to think of a map as a neutral mirror of the world, a faithful reduction of land and sea onto paper. Yet no map can be neutral. Every projection that flattens a spherical Earth onto a flat surface must distort something—area, shape, distance, or direction—and the choice of what to preserve and what to sacrifice is never innocent. A map is an argument disguised as a picture, and learning to read that argument is among the most valuable habits a thinking person can acquire. Consider the Mercator projection, devised in 1569 for ocean navigation, which became the default image of the world in classrooms for centuries. Because it preserves the angles needed to plot a straight compass course, it grotesquely inflates the landmasses near the poles: Greenland appears roughly the size of Africa, though Africa is in reality some fourteen times larger. Generations of schoolchildren absorbed, without ever being told, a picture in which the temperate north loomed vast and the tropical south shrank into insignificance. The distortion was technical in origin, but its psychological residue was political. Mapmakers have long understood this power and have not hesitated to wield it. Medieval European maps placed Jerusalem at the centre of the world; imperial atlases coloured distant colonies in the reassuring tints of the mother country; modern states still quietly redraw contested borders to flatter their claims. None of this means maps are worthless—we could scarcely navigate a city or grasp a climate pattern without them. It means, rather, that a map records not only territory but the assumptions of those who drew it. The discerning reader asks not merely "Where is this?" but "Who made this, and what did they want me to believe?" To read a map critically is, in the end, to read the mind of its maker.

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この単元の問題を3問、解説つきで公開しています

準1級 · 読解 · 全5問

問 1

What is the main idea of the passage?

  • Maps have become worthless now that satellite navigation exists.
  • Medieval mapmakers were more honest than modern ones about their biases.
  • The Mercator projection should be banned from classrooms because it is inaccurate.
  • Maps are not neutral records but persuasive constructions that reflect their makers' choices and assumptions.
Phrase

A map is an argument disguised as a picture

準1級読解地理歴史エッセイ主旨把握
⚡ひとことで

本文全体は「地図は中立な鏡ではなく、作り手の選択と思想を映す説得的な構築物」という論旨。

選択肢の解説Choice Analysis

「Maps are not neutral records but persuasive constructions that reflect their makers' choices and assumptions.」

正解

本文は (1) どの地図も中立ではあり得ない (every projection must distort something)→ (2) メルカトル図法の具体例→ (3) 中世・帝国・現代の地図がいかに権力を行使してきたか、と展開し、最後に a map records not only territory but the assumptions of those who drew it と結論する。したがって「地図は中立な記録ではなく、作り手の選択と前提を反映する説得的構築物だ」が主旨。

  • 「The Mercator projection ought to be banned from every classroom because it is so inaccurate.」

    = メルカトル図法は禁止すべき ━ 本文はメルカトルを例示するだけで『禁止せよ』とは言わず、地図全般の性質を論じている。

  • 「Maps have become entirely worthless now that satellite navigation exists on everyone's phone.」

    = 地図はもはや無価値 ━ 本文は we could scarcely navigate ... without them と地図の有用性を明確に肯定しており正反対。

  • 「The medieval mapmakers were a great deal more honest than modern ones about their own biases.」

    = 中世の方が正直だった ━ 中世も帝国も現代も等しく偏向の例として並べており、時代間の正直さの比較はしていない。

▦Collocation
パターン意味例
a faithful reduction of ~~の忠実な縮約a faithful reduction of land and sea
disguised as ~~を装ったan argument disguised as a picture
preserve A and sacrifice BAを保ちBを犠牲にするwhat to preserve and what to sacrifice
acquire a habit習慣を身につけるa habit a thinking person can acquire
never innocent決して無垢ではないthe choice is never innocent
❝例文

  • No map can be a neutral mirror of the world.

    どんな地図も世界の中立な鏡ではあり得ない。

  • A map is an argument disguised as a picture.

    地図は絵を装った主張だ。

  • Learning to read that argument is a valuable habit.

    その主張を読み解く力は貴重な習慣だ。

💡Tip · 覚えるコツ

主旨設問は第1段の主題提示文 (a map is an argument...) と最終段の結論文 (a map records not only territory but the assumptions...) を結べば速い。具体例 (メルカトル) を主旨と取り違える肢に注意。

問 2

According to the passage, why does the Mercator projection enlarge landmasses near the poles?

  • It sacrifices direction in order to keep every landmass the correct size.
  • It was deliberately designed to make northern countries appear more powerful.
  • It preserves the angles needed to plot a straight compass course, at the cost of distorting area.
  • It accurately represents the true size of polar regions like Greenland.
Phrase

Because it preserves the angles needed to plot a straight compass course, it grotesquely inflates the landmasses near the poles

準1級読解地理歴史エッセイ詳細把握
⚡ひとことで

メルカトルは羅針盤の角度を保つ代わりに極付近の面積を歪める。

選択肢の解説Choice Analysis

「It preserves the angles needed to plot a straight compass course, at the cost of distorting area.」

正解

第2段で『航海用に角度 (the angles needed to plot a straight compass course) を保存するため、極付近の陸塊を著しく膨張させる』と因果を明示する。第1段の every projection must distort ... area とも整合し、角度を保つ代償に面積を歪めるのが拡大の理由。

  • 「It was deliberately designed so as to make the northern countries appear more powerful.」

    = 北を強く見せるため意図的に設計 ━ 本文は distortion was technical in origin と述べ、拡大は技術的副産物。政治的意図は『心理的残滓』であって設計目的ではない。

  • 「accurately represents the true size」

    = 極地の真の大きさを正確に表す ━ グリーンランドがアフリカ大に見えるが実際は14分の1という叙述と正反対。

  • 「It sacrifices direction entirely in order to keep every landmass at the correct size.」

    = 方向を犠牲に面積を正確に保つ ━ メルカトルが保つのは角度・方向で、犠牲にするのは面積。役割が逆。

▦Collocation
パターン意味例
plot a course針路を定めるplot a straight compass course
at the cost of ~~を犠牲にしてat the cost of distorting area
inflate ~~を膨張させるinflate the landmasses
preserve the angles角度を保存するIt preserves the angles.
near the poles極付近でlandmasses near the poles
❝例文

  • The projection preserves angles but distorts area.

    その図法は角度を保つが面積を歪める。

  • Greenland looks as large as Africa on a Mercator map.

    メルカトル図ではグリーンランドがアフリカ大に見える。

  • Africa is in reality some fourteen times larger.

    アフリカは実際には約14倍大きい。

💡Tip · 覚えるコツ

詳細設問は本文の因果 (Because A, B) を選択肢が正しく言い換えているか確認。preserves angles → at the cost of distorting area のトレードオフがカギで、『面積を正確に保つ』は罠。

問 3

Which of the following does the passage cite as an example of mapmakers exercising power?

  • Navigators refused to use any map that distorted the shape of coastlines.
  • Modern states have agreed to use a single standard projection worldwide.
  • Medieval maps deliberately omitted Jerusalem to avoid religious controversy.
  • Imperial atlases coloured distant colonies in the same tints as the mother country.
Phrase

imperial atlases coloured distant colonies in the reassuring tints of the mother country

準1級読解地理歴史エッセイ詳細把握
⚡ひとことで

帝国の地図帳は遠方の植民地を本国と同じ色で塗った。

選択肢の解説Choice Analysis

「Imperial atlases coloured distant colonies in the same tints as the mother country.」

正解

第3段は地図が権力を行使した例を三つ並べる: 中世はエルサレムを世界の中心に置き、帝国の地図帳は植民地を『本国の安心させる色合い (the reassuring tints of the mother country)』で塗り、現代国家は争いのある国境を密かに引き直す。よって『植民地を本国と同じ色で塗った』が本文に挙げられた例。

  • 「Medieval maps deliberately omitted Jerusalem」

    = 中世はエルサレムを省いた ━ 本文は逆で、エルサレムを世界の中心に『置いた (placed at the centre)』。

  • 「agreed to use a single standard projection」

    = 単一の標準図法で合意 ━ 本文は現代国家が国境を『各自の主張に有利に引き直す』と述べ、統一の合意は出てこない。

  • 「Navigators refused to use any map that distorted the shape of coastlines.」

    = 海岸線を歪める地図を拒否 ━ 本文にない。むしろメルカトルは航海のために角度を保ち広く使われた。

▦Collocation
パターン意味例
place A at the centreAを中心に据えるplaced Jerusalem at the centre
the mother country本国・母国tints of the mother country
redraw a border国境を引き直すredraw contested borders
flatter a claim主張を都合よく見せるto flatter their claims
hesitate to V~するのをためらうhave not hesitated to wield it
❝例文

  • Medieval maps placed Jerusalem at the centre of the world.

    中世の地図はエルサレムを世界の中心に置いた。

  • Imperial atlases coloured colonies in the mother country's tints.

    帝国の地図帳は植民地を本国の色で塗った。

  • States redraw contested borders to flatter their claims.

    国家は主張に有利なよう係争国境を引き直す。

💡Tip · 覚えるコツ

別段落の詳細設問は『3つの並列例』を一つずつ照合する。本文の動詞 (placed / coloured / redraw) と選択肢の動詞 (omitted / agreed / refused) のズレが誤答の目印。

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