单项选择题

What does "this" refer to in the expression "this appears less of a hazard"

A．Some foreign power.
B．The design of the security systems.
C．A terrorist attack.
D．Sabotage by people working for an enemy country.
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单项选择题
What is the main theme of the passage
A．The fact that a student was able to make an atomic bomb.
B．The dangers of transporting plutonium.
C．The fact that secret information is available in public libraries.
D．The ease with which atomic bombs could become a terrorist weapon.
单项选择题
Why would a terrorist go to the Atomic Energy commission's public reading room
A．To find out how to design a bomb.
B．To find out where to steal plutonium.
C．To look at files of secret information.
D．To find out where to stem an atomic bom
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