【小站原创】官方真题Official41托福阅读文本及答案解析（Climate of Venus）

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Climate of Venus

(原文略)

Paragraph 1

Earth has abundant water in its oceans but very little carbon dioxide in its relatively thin atmosphere. By contrast, Venus is very dry and its thick atmosphere is mostly carbon dioxide. The original atmospheres of both Venus and Earth were derived at least in part from gases spewed forth, or outgassed, by volcanoes. The gases that emanate from present-day volcanoes on Earth, such as Mount Saint Helens, are predominantly water vapor, carbon dioxide, and sulfur dioxide. These gases should therefore have been important parts of the original atmospheres of both Venus and Earth. Much of the water on both planets is also thought to have come from impacts from comets, icy bodies formed in the outer solar system.

1. According to paragraph 1, in what major respect are Venus and Earth different from each other?【事实信息题】

A. Whether carbon dioxide v/as present in their original atmospheres

B. How thin their original atmospheres were

C. What their present-day atmospheres mainly consist of

D. How long ago they first developed an atmosphere

答案：C

解析：从原文前两句话“Earth has abundant water in its oceans but very little carbon dioxide in its relatively thin atmosphere. By contrast, Venus is very dry and its thick atmosphere is mostly carbon dioxide.”可看出，地球大气层含有很少的二氧化碳，而金星的大气层中却含有大量二氧化碳。所以C选项正确，地球和金星的区别就是如今大气层的组成。

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