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【单选题】

It was from the Lowell Laboratory that the ninth________, Pluto, was sighted in 1930.
A．planet

B．constellation
C．stardom
D．satellite
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根据网考网移动考试中心的统计，该试题：

68%的考友选择了A选项

16%的考友选择了B选项

2%的考友选择了C选项

14%的考友选择了D选项

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