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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单项选择题

From the third paragraph, besides shelter, the seawater is used as

A．detector.
B．sensor.
C．agent.
D．solvent.

单项选择题

What kind of neutrinos would be most useful to astronomers

A．Ones which have no electric charge, or little mass.
B．Ones which are created artificially in the laboratory.
C．Ones which can free themselves from the control of matter.
D．Ones which come through a long distance of time and space.