It was from the Lowell Laboratory that the ninth ______ Pluto, was sighted in 19

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问题 It was from the Lowell Laboratory that the ninth ______ Pluto, was sighted in 1930.

选项 A、planet
B、constellation
C、stardom
D、satellite

答案 A

解析 A．planet行星(尤指太阳系)；B．constellation恒星群，星座；C．stardom明星的身份，演员们；D．satellite人造卫星，又知Pluto是冥王星；答案应为A。

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