单项选择题

A．to
B．on
C．for
D．at
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单项选择题
Which of the following is the most desirable site where cosmic neutrinos can be easily detected
A．Labs with massive detector.
B．Enclosed volcanic caves.
C．Vacuum cabins.
D．Shallow salt lake.
单项选择题
Why is it difficult to detect neutrinos
A．Neutrinos can cross the entire universe.
B．Neutrinos can escape from different regions of space.
C．Neutrinos seldom interact with other particles.
D．Neutrinos are too rare in the space.
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