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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