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.

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单项选择题

The main danger discussed in the passage is from ______.

A．students making their own atomic bombs.
B．foreign spies stealing secrets
C．terrorists stealing plutonium and making their own bombs
D．technicians stealing plutonium

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.