单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. In the author’s opinion, why do we search the stars or moon

A.Because we have made up our mind to do so.
B.Because we want to fulfil our desire for knowledge.
C.Because we want to enjoy the ecstasy of achievement.
D.Because we cannot help ourselves.