单项选择题

A．see
B．think
C．imagine
D．believe
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单项选择题
Judging from the context, the word they (Line 2, Para. 4) refers to______.
A．the security risks
B．the terrorist attacks
C．environmental hazards of over-centralization
D．the security risks, economic expenses, and environmental hazards
单项选择题
A．FortunatelyB．UnfortunatelyC．HappilyD．Unhappily
A．Fortunately
B．Unfortunately
C．Happily
D．Unhappily
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