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

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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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