托福TPO 30 听力Lecture第3篇第2题_What was discovered on Mars that suggests water once existed there?

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题目

What was discovered on Mars that suggests water once existed there?

Microorganisms that can form only in the presence of water.

A mineral that can form only in the presence of water.

Proteins that have the same structure as proteins found on Earth.

Large deposits of iron and potassium that can form only in the presence of water.

题目解析

Well, in 2004, an exploration robot discovered jarosite there. Jarosite is a yellowish brown mineral … it needs highly acidic water to form. 大意是2004年，火星上发现了黄钾铁矾，它是土黄色的矿物，必须有强酸性水才能形成。因此 jarosite 的发现说明火星上曾经有水，所以选择 B 。

答案: B

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