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
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
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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