A-A+
From when was Pluto seriously questioned about
问题详情
From when was Pluto seriously questioned about its planetary status？
A．As early as 1930.
B．More than a decade ago.
C．When the Kuiper Belt was discovered.
D．When Quaoar was discovered.此题为多项选择题。请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：D
解析：细节题。解题点在文章第六段。该段首句提到“The rub now is Quaoar”，接着又提到“The case is going to get a lot harder to defend the day somebody finds something larger than Pluto”，由此可知，Quaoar的发现增强了人们对冥王星的质疑。导致捍卫冥王星地位变得困难，所以正确答案是D选项。
