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  3. The first sentence in Paragraph 1 is used by American school children because The standards of planet are open to question beca

The first sentence in Paragraph 1 is used by American school children because The standards of planet are open to question beca

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问题 The first sentence in Paragraph 1 is used by American school children because
The standards of planet are open to question because
选项 A、Pluto is now one of the nine planets.
B、Pluto is a historical mistake.
C、objects of size similar to Pluto are not recognized.
D、2003 UB313 is larger than Pluto.
答案C
解析 事实细节题。定位第四段，看到首句出现了the question，正是对有关该星体是否为行星进行的说明，故确定为本题考点。该句指出：新星体是否是行星再次引发了有关什么是行星的争论。第二句和第三句提到：在过去几年里，发现了一些与冥王星差不多大，但稍小些的星体，人们并不认为它们是行星，主要是因为其体积比冥王星小。可见这是引起对判断行星的标准产生争议的原因。此处内容与冥王，星是否为九大行星之一无关；这里并没有对冥王星是行星这一事实提出质疑，"Pluto is a historical mistake"毫无根据。本段倒数第二句提到"2003UB313 is larger than Pluto"中内容，但人们质疑的是体积比冥王星小的物体被认为不是行星，那么体积比冥王星大的就是行星吗?可见与答案选项相比，这只是间接原因，故排除。
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