单项选择题

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

A．detector.
B．sensor.
C．agent.
D．solvent.
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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.
单项选择题
escape from (Line 6, Para. 1) can be substituted for
A．get through,
B．pass by.
C．interact with.
D．derive from.
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