テーマ: アメリカ空軍のコックピット設計をめぐる「平均的パイロット」の神話(Todd Roseの議論)を参考にしたオリジナル読解問題です。

■ 本文(オリジナル)

In the mid-twentieth century, engineers designing airplane cockpits relied on a single guiding assumption: if they built a cockpit to fit the average pilot, it would comfortably fit the vast majority of pilots. Acting on this assumption, they carefully measured hundreds of pilots and calculated average values for dimensions such as height, arm length, and chest circumference. It came as a shock, then, when a young researcher decided to check individual pilots against these averages and discovered that not a single pilot matched the average on every dimension simultaneously. Being average overall, it turned out, required being unusual in at least one respect. Once the military abandoned the idea of designing for an imaginary average person and instead built adjustable seats, pedals, and straps, pilot performance improved dramatically. The lesson extends well beyond aviation: whenever an institution builds its systems around an average drawn from a large population, it risks designing something that fits nobody in particular.

---

======================================================================
■ 設問1: 和訳問題

次の下線部を日本語に訳しなさい。

“whenever an institution builds its systems around an average drawn from a large population, it risks designing something that fits nobody in particular”

【解答】
ある組織が、大規模な集団から導き出された平均値を中心にシステムを構築するときはいつでも、その組織は、特に誰にも合わない何かを設計してしまう危険を冒すことになる。

【解説】
文構造: [副詞節: whenever(接続詞) an institution builds its systems around an average drawn from a large population], [S: it(代名詞、=an institution)] [V: risks(動詞)] [O: designing(動名詞) something that fits nobody in particular(関係代名詞節)]
品詞: whenever(複合関係副詞、「〜するときはいつでも」)、drawn from(過去分詞句、an averageを後置修飾、「〜から導き出された」)、risks doing(risk+動名詞「〜する危険を冒す」)、that fits(関係代名詞節、somethingを修飾)
ポイント: risk doing「〜する危険を冒す」という動名詞をとる動詞の用法と、drawn from a large population(過去分詞の後置修飾)という2つの重要文法事項が組み込まれている一文。

======================================================================
■ 設問2: 並べ替え問題

かっこ内の語句を正しく並べ替え、意味の通る英文を完成させなさい。

It came as a shock, then, ( when / a young researcher / decided to check / individual pilots / against these averages / and / discovered / that / not a single pilot / matched the average / on every dimension / simultaneously ).

【解答】
It came as a shock, then, when a young researcher decided to check individual pilots against these averages and discovered that not a single pilot matched the average on every dimension simultaneously.
そして、ある若い研究者が個々のパイロットをこれらの平均値と照合することにし、あらゆる寸法において平均に一致するパイロットは一人もいないことを発見したとき、それは衝撃として受け止められた。

【解説】
文構造: [形式主語: It(代名詞)] [V: came(動詞)] [C: as a shock(前置詞句)], [when節: when(接続詞) a young researcher decided to check individual pilots against these averages and discovered that not a single pilot matched the average on every dimension simultaneously]
when節内構造: [S: a young researcher(名詞句)] [V1: decided to check(動詞句)] [O1: individual pilots against these averages] and [V2: discovered(動詞)] [O2: that not a single pilot matched the average…(名詞節)]
品詞: decided to check(decide to do、不定詞の名詞用法)、discovered that(that節を目的語にとる動詞)、not a single pilot「一人のパイロットも〜ない」(強い否定を表す表現)
ポイント: not a single 名詞は「一つの〜も…ない」という強調的な全否定表現。When節の中でand によってdecided…とdiscovered…という2つの動詞(V1とV2)が同じ主語a young researcherに対して並列されている構造を正確に把握する。

======================================================================
■ 設問3: 語句変形問題(3問)

次の各文の( )内の語を、文脈に合う適切な形に変えなさい。

1. Engineers relied on a single (guide) assumption when designing airplane cockpits.
2. Being average overall, it turned out, (require) being unusual in at least one respect.
3. Once the military abandoned the idea of designing for an imaginary average person, pilot performance (improve) dramatically.

【解答と解説】

1. 正解: guiding
   文構造: [O: a single guiding(現在分詞) assumption(名詞句)]
   品詞: guiding(現在分詞、assumptionを前置修飾、「導きとなる」という能動的な意味)
   解説: assumptionは「導く」側なので能動関係となり現在分詞guidingが正しい(guided assumptionだと「導かれた仮定」という受動の意味になり不自然)。
2. 正解: required
   文構造: [S: Being average overall(動名詞句=主語)], it turned out(挿入句), [V: required(動詞)] [O: being unusual(動名詞) in at least one respect]
   品詞: required(過去形、文全体の時制はturned outという過去形に合わせる)、being average/being unusual(いずれも動名詞、それぞれ主語・目的語の働き)
   解説: it turned outという過去の判明を表す表現に合わせて、主節の動詞も過去形requiredにする(時制の一致)。
3. 正解: improved
   文構造: [when節: Once the military abandoned…], [S: pilot performance(名詞句)] [V: improved(動詞)] [副詞: dramatically]
   品詞: improved(過去形、主節の動詞)
   解説: 文全体が過去の出来事を回想する文脈であり、abandoned(過去形)と時制を合わせてimprovedという過去形にする。

======================================================================
■ 設問4: 内容一致・言い換え・解釈問題(3問)

本文の内容に関する次の各問いに対して、最も適切なものを1つずつ選びなさい。

1. According to the passage, what assumption did engineers originally rely on when designing airplane cockpits?
   (A) That every pilot should have a custom-built cockpit.
   (B) That a cockpit built to fit the average pilot would comfortably fit the vast majority of pilots.
   (C) That cockpit design had no effect on pilot performance.
   (D) That only the tallest pilots should be allowed to fly.
2. Which of the following best paraphrases “not a single pilot matched the average on every dimension simultaneously”?
   (A) Every pilot matched the average on every dimension at the same time.
   (B) No pilot matched the average across all dimensions at once.
   (C) Only one pilot in the entire study matched the average exactly.
   (D) The average measurements were later found to be completely inaccurate.
3. What happened after the military abandoned the idea of designing for an average pilot, according to the passage?
   (A) Pilot performance declined significantly.
   (B) The military stopped building cockpits altogether.
   (C) Adjustable seats, pedals, and straps were introduced, and pilot performance improved dramatically.
   (D) The average pilot was finally identified and used as the new design standard.

【解答と解説】

1. 正解: (B)
   本文該当箇所: “if they built a cockpit to fit the average pilot, it would comfortably fit the vast majority of pilots”
   解説: 本文冒頭の仮定にそのまま一致。(A)(C)(D)は本文に記述なし、または矛盾。
2. 正解: (B)
   本文該当箇所: “not a single pilot matched the average on every dimension simultaneously”
   解説: not a single「一人も〜ない」という全否定表現なので、「あらゆる寸法で同時に平均と一致するパイロットは一人もいなかった」という意味になる。(A)は正反対の内容。
3. 正解: (C)
   本文該当箇所: “instead built adjustable seats, pedals, and straps, pilot performance improved dramatically”
   解説: 調整可能な座席・ペダル・ストラップが導入され、パフォーマンスが劇的に向上したと明記されている。(A)は逆の内容、(D)は本文の趣旨(平均という概念自体を放棄した)と矛盾。