机经真题 3 Set 2

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What is the lecture mainly about?

  • A. Similarities and differences between a planet and its moon

  • B. A possible explanation of the cause of a planet's appearance

  • C. A project to send a high-speed projectile into Mercury's regolith

  • D. Two opposing views about the atmospheres of rocky planets

显示答案 正确答案: B

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  • 本题对应音频：
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    音频1
    解析
    题干分析：讲座主旨。
    原文定位：
    P: So Mercury is almost airless, but not quite. The same is true for Earth's moon. It does have a rudimentary atmosphere, despite what most people think. What else do Mercury and the moon have in common? Based on what you've read so far, Nancy,
    S: They're both covered with craters where meteorites have hit them, impact craters,
    P: Right? So is there a connection between impact craters and atmospheres?……Okay, but let's talk about a difference between Mercury and the moon. And there's a connection here to meteorite bombardment. When you look at the moon, it seems to shine, right because?
    S: Its surface reflects light from the sun,
    P: Yes, but Mercury's surface appears darker because?
    S: It reflects less sunlight, 
    P: Good, and why is that?


    选项分析：教授首先提到月球和水星的两个共同点做铺垫：表面没有什么大气层，有很多陨石坑。然后提到了它们的一个不同点：月球的表面更亮、水星的表面更暗，随后整篇文章都在解释这个不同点是怎么产生的，可知应选B选项。月球并不是水星的卫星，A选项错误；砸到水星表面的抛射物是自然产生的，并非人的项目，C选项错误；D选项未提及。

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