题目内容
（请给出正确答案）
[主观题]
What does "this" refer to in the expression "this appears less of a hazard" ？A．Some foreig
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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