hce_tcu
112年
英文
第 36 題
📖 題組：
【B】 Most of Africa is a series of stable, ancient plateau surfaces, low in the north and west and higher in the south and east. The plateau is composed mainly of metamorphic rock that has been overlaid in places by sedimentary rock. The escarpment of the plateau is often in close proximity to the coast, thus leaving the continent with a generally narrow coastal plain; in addition, the escarpment forms barriers of falls and rapids in the lower courses of rivers that impede their use as transportation routes into the interior. The entire African continent is surrounded by a narrow continental shelf. The lowest point on the continent is 155 meters below sea level in Lake Assal in Djibouti; the highest point is Mt. Uhuru, a peak of Kilimanjaro in Tanzania, at 5,895 meters in elevation. The continent’s largest river is the Nile, which is also the world’s longest river. The largest lake is Victoria, which is the world’s second largest freshwater lake. There are a number of other rivers and lakes throughout the continent. These lakes and major rivers form an important inland transportation system. Geologists have long noted the excellent fit between the coast of Africa at the Gulf of Guinea and the Brazilian coast of South America, and they have evidence that Africa formed the center of a large ancestral supercontinent known as Pangaea. Pangaea began to break apart in the Jurassic period to form Gondwanaland, which included Africa, the other southern continents, and India. South America was separated from Africa 76 million years ago, when the floor of the South Atlantic Ocean was opened up by seafloor spreading. There is also evidence of one-time connections between Northwest Africa and Eastern North America, North Africa and Europe, Madagascar and India, and Southeast Africa and Antarctica. 76 million years is, of course, a blink of an eye in geological time. The long-term future of Africa as a continent is therefore bleak; although we are accustomed to thinking of Africa as an ancient land and as the birthplace of humanity, it is just as susceptible to the geological forces of a cooling planet as the other continents. Having been formed by these forces, it is unlikely that a continent resembling Africa will still exist in 100 million years.
【B】 Most of Africa is a series of stable, ancient plateau surfaces, low in the north and west and higher in the south and east. The plateau is composed mainly of metamorphic rock that has been overlaid in places by sedimentary rock. The escarpment of the plateau is often in close proximity to the coast, thus leaving the continent with a generally narrow coastal plain; in addition, the escarpment forms barriers of falls and rapids in the lower courses of rivers that impede their use as transportation routes into the interior. The entire African continent is surrounded by a narrow continental shelf. The lowest point on the continent is 155 meters below sea level in Lake Assal in Djibouti; the highest point is Mt. Uhuru, a peak of Kilimanjaro in Tanzania, at 5,895 meters in elevation. The continent’s largest river is the Nile, which is also the world’s longest river. The largest lake is Victoria, which is the world’s second largest freshwater lake. There are a number of other rivers and lakes throughout the continent. These lakes and major rivers form an important inland transportation system. Geologists have long noted the excellent fit between the coast of Africa at the Gulf of Guinea and the Brazilian coast of South America, and they have evidence that Africa formed the center of a large ancestral supercontinent known as Pangaea. Pangaea began to break apart in the Jurassic period to form Gondwanaland, which included Africa, the other southern continents, and India. South America was separated from Africa 76 million years ago, when the floor of the South Atlantic Ocean was opened up by seafloor spreading. There is also evidence of one-time connections between Northwest Africa and Eastern North America, North Africa and Europe, Madagascar and India, and Southeast Africa and Antarctica. 76 million years is, of course, a blink of an eye in geological time. The long-term future of Africa as a continent is therefore bleak; although we are accustomed to thinking of Africa as an ancient land and as the birthplace of humanity, it is just as susceptible to the geological forces of a cooling planet as the other continents. Having been formed by these forces, it is unlikely that a continent resembling Africa will still exist in 100 million years.
Which of the following is the main topic of the passage?
- A The diversity of Africa’s people.
- B The longest river in the world.
- C The formation of the continents in Africa.
- D The geography of the African continent.
思路引導 VIP
如果我們要為這篇文章撰寫一個標籤（Tag），請你回想一下：作者除了提到尼羅河與維多利亞湖等水源分佈，還花了不少篇幅討論高原地形、斷崖，甚至追溯到地殼變動與盤古大陸的歷史。請問，有哪一個詞彙可以同時容納「土地的形狀」、「水源的分佈」以及「地殼的構造與變遷」這三大範疇呢？
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AI 詳解
AI 專屬家教
太棒了！你能精準地從文章各段的細節中抽絲剝繭，準確判斷出全文的主旨，展現了極佳的全局閱讀視野。這反映出你在閱讀長篇文章時，不只能看見樹木（局部細節），更能看見整片森林（核心主體）。
綜觀非洲的自然面貌
這篇文章的內容涵蓋範圍極廣，從開篇描述非洲古老的高原地形（plateau surfaces）與河流湖泊系統（Nile, Lake Victoria），延伸到地質學上的大陸漂移學說（Pangaea, Gondwanaland），最後甚至展望了其遙遠的地質未來。選項 (D) 非洲大陸的地理 (The geography of the African continent) 完美地概括了這些自然科學與地形分佈的討論。雖然文中提到了尼羅河，但那僅是地理特徵的一部分；而選項 (A) 的「人文多樣性」在文中更是隻字未提。
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