1. When was Pluto officially declared to be found?
A The date when Percival Lowell was born.
B On March 13, 1930.
C On May 1, 1330.
D On the birthday of Venetia Burney.
2. Who originally named the newly found planet as Pluto?
A Percival Lowell.
B Clyde Tombaugh.
C V.M. Slipher.
D Venetia Burnye.
答案：1. B 2. D内容来自 听力课堂网：http://www.tingclass.net/show-5859-19069-1.html