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
A．15 yearsB．50 yearsC．six decadesD．four decades
A．15 years
B．50 years
C．six decades
D．four decades
单项选择题
A．In the days before the vote, the Clinton Administration had been careful to describe the referendum as an internal matter.B．It is critical for the United States to have a stable northern neighbor.C．Mr. Clinton discussed the outcome of the referendum Tuesday with Canadian Prime Minister.D．Both pacts will be discussed further with united Canad
A．In the days before the vote, the Clinton Administration had been careful to describe the referendum as an internal matter.
B．It is critical for the United States to have a stable northern neighbor.
C．Mr. Clinton discussed the outcome of the referendum Tuesday with Canadian Prime Minister.
D．Both pacts will be discussed further with united Canad
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