In the last paragraph, the author describes the development of astronomy in order to
A. suggest the potential discovery of celestial bodies by means of neutrino astronomy.
B. illustrate the importance of surprises in making astronomic discoveries.
C. demonstrate the effectiveness of the DUMAND apparatus in detecting neutrinos.
D. name some cosmic phenomena that neutrino astronomy will illuminate.
正确答案是（）
A. group
B. individual
C. personnel
D. corporation
What is the author's attitude towards the idea that "profit opportunities are rare"？
A. Doubtful.
B. Cautious.
Consenting.
D. Ironic.
正确答案是（）
A. improper
B. risky
C. fair
D. wise
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